Rainbow Electronics 71M6542G - Manual (Page 69)

v1.1 © 2008–2011 Teridian Semiconductor Corporation 69
LCD Drivers (71M6541D/F)
With a maximum of 35 LCD driver pins available, the 71M6541D/F is capable of driving up to 6 x 35 = 210
pixels of an LCD display when using the 6 x multiplex mode. At eight pixels per digit, this corresponds to
26 digits.
LCD segment data is written to the LCD_SEGn[5:0] I/O RAM registers as described in 2.5.8.2 and 2.5.8.3.
SEG46 through SEG50 cannot be configured as DIO pins. Display data for these pins are written to I/O
RAM registers LCD_SEG46[5:0] through LCD_SEG50[5:0] (see
Table 58 ). When the ICE_E pin is pulled
high, it overrides the SEG functionality, and pins E_RXTX/SEG48, E_TCLK/SEG49 and E_RST/SEG50
function as ICE interface pins.
LCD_MAP[46] and LCD_MAP[47] (I/O RAM 0x2406[6] and 0x2407[7]) must be set to 1 in order to permit
TMUX2OUT/SEG46 and TMUXOUT/SEG47 to operate as SEG drivers, otherwise. If LCD_MAP[46] and
LCD_MAP[47] are 0, these pins operate as TMU2XOUT and TMUXOUT (see
2.5.12 Test Ports
(TMUXOUT and TMUX2OUT Pins) on page 78 ).
Table 58: 71M6541D/F LCD Data Registers for SEG46 to SEG50
SEG 46 47 48 49 50
Pin # 61 60 38 37 36
Configuration
Always LCD pins, except
when used for ICE interface
or TMUXOUT/TMUX2OUT.
SEG Data Register
LCD_S
E
G
46[
5:
0]
LCD_S
E
G
47[
5:
0]
LCD_S
E
G
48[
5:
0]
LCD_S
E
G
49[
5:
0]
LCD_S
E
G
50[
5:
0]