diff --git a/README.md b/README.md
index aeb4127..ccdee91 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,4 @@
-PCD8544
-=======
+# MicroPython PCD8544
 
 A MicroPython library for the PCD8544 84x48 LCD, used by the Nokia 5110 display.
 
@@ -55,16 +54,16 @@ BL = Pin(12, Pin.OUT, value=1)
 lcd = pcd8544.PCD8544(spi, CE, DC, RST)
 
 # test pattern (50% on)
-lcd._write_data(bytearray([0x55, 0xAA] * 42 * 6))
+lcd.data(bytearray([0x55, 0xAA] * 42 * 6))
 
 # bitmap smiley (horzontal msb)
 lcd.clear()
 # draw 8x16 in bank 0
 lcd.position(0, 0)
-lcd._write_data(bytearray(b'\xE0\x38\xE4\x22\xA2\xE1\xE1\x61\xE1\x21\xA2\xE2\xE4\x38\xE0\x00'))
+lcd.data(bytearray(b'\xE0\x38\xE4\x22\xA2\xE1\xE1\x61\xE1\x21\xA2\xE2\xE4\x38\xE0\x00'))
 # draw 8x16 in bank 1
 lcd.position(0, 1)
-lcd._write_data(bytearray(b'\x03\x0C\x10\x21\x21\x41\x48\x48\x48\x49\x25\x21\x10\x0C\x03\x00'))
+lcd.data(bytearray(b'\x03\x0C\x10\x21\x21\x41\x48\x48\x48\x49\x25\x21\x10\x0C\x03\x00'))
 
 # toggle display, DDRAM persists image
 lcd.power_off()
@@ -72,7 +71,7 @@ lcd.power_on()
 
 # nokia logo bitmap
 lcd.clear()
-lcd._write_data(bytearray(b'\x80\x00\x00\x80\x00\x00\x80\x00\x00\x80\x00\x00\x80\x00\x00\x80\x00\x00\x80\x80\x40\x40\x40\x80\x80\xC0\xC0\x40\xC0\xA0\xE0\xC0\xE0\xE0\xF0\xF0\xF8\xF8\xF8\xFC\xFC\xFE\xEE\xF4\xF0\xF0\x70\x30\x00\x80\x00\x00\x80\x00\x0C\x9C\x1C\x38\xB8\x38\x38\xB8\xF8\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF8\xF8\xF8\xF8\x88\x20\x8A\x20\x08\x22\x08\x00\x0A\x00\x00\x02\x80\x71\xBA\xDA\xFD\xDD\xED\xDE\xEE\xF7\xFF\xFB\xFD\xFD\xFE\xFF\x7F\x3F\x1F\x9F\x3F\x7F\x6F\x0F\xAF\x1F\xBF\x3E\x3C\x7A\x78\x70\x22\x88\xA0\x2A\x80\x08\x62\xE0\xE0\xF2\xF0\x58\xDA\xF8\xFC\x92\xFE\xFF\xFF\xD3\xFF\xFD\xF3\xE1\xF0\xF9\x7F\xBF\x3F\x8F\x2F\x4F\xAF\x0F\x4F\xA7\x0F\xAF\x87\x2F\x82\x80\x20\xC0\x80\x80\x50\x40\xC4\xD0\xA0\xE8\xE4\xEA\xFF\xFB\xFD\xFF\xFF\xFF\xFF\xFF\xEF\x4F\x27\x53\xA8\x54\x29\x4A\xB5\x82\xAC\xA1\x8A\xB6\x50\x4D\x32\xA4\x4A\xB4\xA9\x4A\x52\xB4\xAA\x45\xA8\xDA\x22\xAC\xD2\x2A\x52\xA8\x52\x4C\xB0\xAD\x43\x5B\xB3\x45\xA8\x5B\xA3\xAB\x55\xA8\x52\x54\xA9\x56\xA8\x45\xBA\xA4\x49\x5A\xA2\x54\xAA\x52\xFE\xFF\xFF\xFE\xFD\xFF\xFF\xFF\xFE\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F\xFF\xFE\xBF\x7F\xBF\xBF\xFF\xDF\xBF\x5F\xDF\x7F\xDF\x7F\xDF\xAF\x7F\xEE\x8E\xF1\x6E\x99\xF7\x6A\xDD\xB2\x6E\xD5\x7A\xD7\xAC\x75\xDB\x6D\xD5\x7A\xD7\xAC\x7B\xE5\xDE\xA9\x77\xDA\xB5\xEE\x59\xB6\xEB\xDD\xB6\x69\xD6\xBF\xE8\x55\xEF\xB9\xD6\xED\xB5\x5B\xAB\xFF\xFD\xF7\xFF\x01\x01\x01\x01\xE1\xC1\x81\x03\x05\x0F\x1D\x2F\x7E\x01\x00\x01\x01\xFF\xFE\x03\x01\x01\x00\xF1\xF0\xF1\x71\xF1\xF1\xB1\xF1\x01\x01\x01\x03\xFE\xFF\x01\x01\x01\x01\xBE\x1B\x0D\x07\x03\x41\xE1\xF1\xF9\x6D\xFF\xFF\x00\x01\x01\x01\xFF\xFF\xEB\x3E\x0D\x03\x01\x41\x71\x70\x41\x01\x03\x0E\x3B\xEF\xFE\xFB\xEE\x7D\xF7\xFF\xFF\xFF\xFF\xFE\xFF\xF0\xF0\xF0\xF0\xFF\xFF\xFF\xFF\xFE\xFC\xF8\xF0\xF0\xF0\xF0\xF0\xF0\xFF\xFF\xF8\xF0\xF0\xF0\xF1\xF1\xF1\xF1\xF1\xF1\xF1\xF1\xF0\xF0\xF0\xF8\xFF\xFF\xF0\xF0\xF0\xF0\xFF\xFF\xFE\xFC\xF8\xF0\xF0\xF1\xF3\xF7\xFF\xFF\xF0\xF0\xF0\xF0\xFF\xF3\xF0\xF0\xF0\xFC\xFC\xFC\xFC\xFC\xFC\xFC\xFC\xF0\xF0\xF0\xF3\xFF\xFF\xFF\xFF\xFF'))
+lcd.data(bytearray(b'\x80\x00\x00\x80\x00\x00\x80\x00\x00\x80\x00\x00\x80\x00\x00\x80\x00\x00\x80\x80\x40\x40\x40\x80\x80\xC0\xC0\x40\xC0\xA0\xE0\xC0\xE0\xE0\xF0\xF0\xF8\xF8\xF8\xFC\xFC\xFE\xEE\xF4\xF0\xF0\x70\x30\x00\x80\x00\x00\x80\x00\x0C\x9C\x1C\x38\xB8\x38\x38\xB8\xF8\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF0\xF8\xF8\xF8\xF8\x88\x20\x8A\x20\x08\x22\x08\x00\x0A\x00\x00\x02\x80\x71\xBA\xDA\xFD\xDD\xED\xDE\xEE\xF7\xFF\xFB\xFD\xFD\xFE\xFF\x7F\x3F\x1F\x9F\x3F\x7F\x6F\x0F\xAF\x1F\xBF\x3E\x3C\x7A\x78\x70\x22\x88\xA0\x2A\x80\x08\x62\xE0\xE0\xF2\xF0\x58\xDA\xF8\xFC\x92\xFE\xFF\xFF\xD3\xFF\xFD\xF3\xE1\xF0\xF9\x7F\xBF\x3F\x8F\x2F\x4F\xAF\x0F\x4F\xA7\x0F\xAF\x87\x2F\x82\x80\x20\xC0\x80\x80\x50\x40\xC4\xD0\xA0\xE8\xE4\xEA\xFF\xFB\xFD\xFF\xFF\xFF\xFF\xFF\xEF\x4F\x27\x53\xA8\x54\x29\x4A\xB5\x82\xAC\xA1\x8A\xB6\x50\x4D\x32\xA4\x4A\xB4\xA9\x4A\x52\xB4\xAA\x45\xA8\xDA\x22\xAC\xD2\x2A\x52\xA8\x52\x4C\xB0\xAD\x43\x5B\xB3\x45\xA8\x5B\xA3\xAB\x55\xA8\x52\x54\xA9\x56\xA8\x45\xBA\xA4\x49\x5A\xA2\x54\xAA\x52\xFE\xFF\xFF\xFE\xFD\xFF\xFF\xFF\xFE\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F\xFF\xFE\xBF\x7F\xBF\xBF\xFF\xDF\xBF\x5F\xDF\x7F\xDF\x7F\xDF\xAF\x7F\xEE\x8E\xF1\x6E\x99\xF7\x6A\xDD\xB2\x6E\xD5\x7A\xD7\xAC\x75\xDB\x6D\xD5\x7A\xD7\xAC\x7B\xE5\xDE\xA9\x77\xDA\xB5\xEE\x59\xB6\xEB\xDD\xB6\x69\xD6\xBF\xE8\x55\xEF\xB9\xD6\xED\xB5\x5B\xAB\xFF\xFD\xF7\xFF\x01\x01\x01\x01\xE1\xC1\x81\x03\x05\x0F\x1D\x2F\x7E\x01\x00\x01\x01\xFF\xFE\x03\x01\x01\x00\xF1\xF0\xF1\x71\xF1\xF1\xB1\xF1\x01\x01\x01\x03\xFE\xFF\x01\x01\x01\x01\xBE\x1B\x0D\x07\x03\x41\xE1\xF1\xF9\x6D\xFF\xFF\x00\x01\x01\x01\xFF\xFF\xEB\x3E\x0D\x03\x01\x41\x71\x70\x41\x01\x03\x0E\x3B\xEF\xFE\xFB\xEE\x7D\xF7\xFF\xFF\xFF\xFF\xFE\xFF\xF0\xF0\xF0\xF0\xFF\xFF\xFF\xFF\xFE\xFC\xF8\xF0\xF0\xF0\xF0\xF0\xF0\xFF\xFF\xF8\xF0\xF0\xF0\xF1\xF1\xF1\xF1\xF1\xF1\xF1\xF1\xF0\xF0\xF0\xF8\xFF\xFF\xF0\xF0\xF0\xF0\xFF\xFF\xFE\xFC\xF8\xF0\xF0\xF1\xF3\xF7\xFF\xFF\xF0\xF0\xF0\xF0\xFF\xF3\xF0\xF0\xF0\xFC\xFC\xFC\xFC\xFC\xFC\xFC\xFC\xF0\xF0\xF0\xF3\xFF\xFF\xFF\xFF\xFF'))
 
 lcd.invert(True)
 lcd.invert(False)
@@ -106,14 +105,28 @@ framebuf.rect(40, 16, 8, 8, 1)
 framebuf.fill_rect(16, 32, 8, 8, 1)
 
 lcd.position(0, 0)
-lcd._write_data(buffer)
+lcd.data(buffer)
 
 framebuf.fill(0)
-lcd._write_data(buffer)
+lcd.data(buffer)
 ```
 
 See [pcd8544_examples.py](pcd8544_examples.py) for more.
 
+## Addressing
+
+Each animation frame represents 1 of 504 bytes written to the DDRAM. `lcd.data(bytearray(b'\xFF'))`
+
+In horizontal mode you can use framebuf with MONO_VLSB format. Vertical mode does not have a compatible framebuf format.
+
+**Horizontal**
+
+![Horizontal](docs/pcd8544-horizontal.gif)
+
+**Vertical**
+
+![Vertical](docs/pcd8544-vertical.gif)
+
 ## Parts
 
 * [WeMos D1 Mini](https://www.aliexpress.com/store/product/D1-mini-Mini-NodeMcu-4M-bytes-Lua-WIFI-Internet-of-Things-development-board-based-ESP8266/1331105_32529101036.html) $4.00 USD
diff --git a/docs/pcd8544-horizontal.gif b/docs/pcd8544-horizontal.gif
new file mode 100644
index 0000000..9b5c28a
Binary files /dev/null and b/docs/pcd8544-horizontal.gif differ
diff --git a/docs/pcd8544-vertical.gif b/docs/pcd8544-vertical.gif
new file mode 100644
index 0000000..b479304
Binary files /dev/null and b/docs/pcd8544-vertical.gif differ
diff --git a/pcd8544.py b/pcd8544.py
index 94502dd..66fe40c 100644
--- a/pcd8544.py
+++ b/pcd8544.py
@@ -66,7 +66,7 @@ def init(self, horizontal=True, contrast=0x3f, bias=BIAS_1_40, temp=TEMP_COEFF_2
 			self.fn |= ADDRESSING_VERT
 
 		self.contrast(contrast, bias, temp)
-		self._write_cmd(DISPLAY_NORMAL)
+		self.cmd(DISPLAY_NORMAL)
 		self.clear()
 
 	def reset(self):
@@ -81,11 +81,11 @@ def reset(self):
 	def power_on(self):
 		self.cs(1)
 		self.fn &= ~POWER_DOWN
-		self._write_cmd(self.fn)
+		self.cmd(self.fn)
 
 	def power_off(self):
 		self.fn |= POWER_DOWN
-		self._write_cmd(self.fn)
+		self.cmd(self.fn)
 
 	def contrast(self, contrast=0x3f, bias=BIAS_1_40, temp=TEMP_COEFF_2):
 		for cmd in (
@@ -101,28 +101,28 @@ def contrast(self, contrast=0x3f, bias=BIAS_1_40, temp=TEMP_COEFF_2):
 			SET_VOP | contrast,
 			# revert to basic instruction set
 			self.fn & ~EXTENDED_INSTR):
-			self._write_cmd(cmd)
+			self.cmd(cmd)
 
 	def invert(self, invert):
-		self._write_cmd(DISPLAY_INVERSE if invert else DISPLAY_NORMAL)
+		self.cmd(DISPLAY_INVERSE if invert else DISPLAY_NORMAL)
 
 	def clear(self):
 		# clear DDRAM, reset x,y position to 0,0
-		self._write_data([0] * (self.height * self.width // 8))
+		self.data([0] * (self.height * self.width // 8))
 		self.position(0, 0)
 
 	def position(self, x, y):
 		# set cursor to column x (0~83), bank y (0~5)
-		self._write_cmd(COL_ADDR | x) # set x pos (0~83)
-		self._write_cmd(BANK_ADDR | y) # set y pos (0~5)
+		self.cmd(COL_ADDR | x) # set x pos (0~83)
+		self.cmd(BANK_ADDR | y) # set y pos (0~5)
 
-	def _write_cmd(self, command):
+	def cmd(self, command):
 		self.dc(0)
 		self.cs(0)
 		self.spi.write(bytearray([command]))
 		self.cs(1)
 
-	def _write_data(self, data):
+	def data(self, data):
 		self.dc(1)
 		self.cs(0)
 		self.spi.write(pack('B'*len(data), *data))
diff --git a/setup.py b/setup.py
index 4d72a30..6bfd2c0 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
 setup(
     name='micropython-pcd8544',
     py_modules=['pcd8544'],
-    version='1.0.0',
+    version='1.1.0',
     description='MicroPython library for the PCD8544 LCD, used by Nokia 5110 displays.',
     long_description='This library lets you communicate with LCDs using the Philips PCD8544 84x48 monochrome LCD driver, for example the Nokia 5110 display.',
     keywords='pcd8544 monochrome lcd nokia micropython',