PS081 datasheet(72/155 Pages) AMSCO

72 / 155 page

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4-15

PSØ81

lcd_spi_out[2:0]

Set the LCD pins as SPI outputs, 6 pins in parallel each.

xx1

switch on LCD_COM1...LCD_COM4,LCD_SEG1,LCD_SEG2 as SCK

x1x

switch on LCD_SEG3...LCD_SEG8 as SSN

1xx

switch on LCD_SEG9...LCD_SEG14 as SDO

spi_delay[2:0]

Sets the timing for the LCD SPI master interface

0 =

fast (about 500 ns period)

7 =

slow (about 10 µs period)

Programming:

After a no2lcd opcode the registers 61 and 62 hold the pixel data according to standard segments.

The re-arrangement according to lcd_pos is done in the LCD driver. After opcode newlcd the re-ar-

ranged data can be read from RAM addresses:

reg_lcd_pix_sort61= 64+32+2 = 98

reg_lcd_pix_sort62= 64+32+3 = 99

It is reasonable to wait a few cycles after the new_lcd command.

There are new opcodes that support the LCD SPI master:

ssnPulseGenerates a positive pulse on the “SSN” line (lines LCD_SEG3...LCD_SEG8)

ssnSet

Sets “SSN” to HIGH.

spi2lcd

This opcode sends the content of accumuator y to the SPI interface. The second

parameter defines, how many bits are transmitted. This function is mainly needed when operating an

external LCD driver via SPI.

Note:

no2lcd opcode formats the number for output on the external LCD. It always has to be used in

combination with newlcd opcode

Maybe you need to adapt lcd_pos in register 12 according to your LCD

Please be aware that accumulator x, y and z are used and modified by no2lcd and spi2lcd op-

codes.

There is no possibility to connect both – the internal and external LCD. Only one mode at a time

can be driven.

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