Z51F3220FNX Datasheet, PDF (269/312 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

(1/ 2 BIAS)
VLCD
Z51F3220
Product Specification
(1/ 3 BIAS)
DISP
LCTEN
VLCD
VLC0
VLC1
VLC2
VLC3
R’
R’
VSS
(1/ 4 BIAS)
VLCD
DISP
LCTEN
VLC0
VLC1
VLC2
VLC3
DISP
LCTEN
VLC0
VLC1
VLC2
VLC3
R’
R’
R’
VSS
R’
R’
R’
R’
VSS
NOTES)
1. When the external resistor bias is selected, the internal resistors for bias are disconnected.
2. When the external resistor bias is selected, the dividing resistors should be connected like the above figure
and the needed bias pins should be selected as the LCD bias function pins (VLC0, VLC1, VLC2, and VLC3) by
P4FSR register.
- When it is 1/2 bias, the P43/VLC0 and P41/VLC2 pins should be selected as VLC0 and VLC2 functions.
The other pins can be used for normal I/O.
- When it is 1/3 bias, the P43/VLC0, P42/VLC1, and P41/VLC2 pins should be selected as VLC0, VLC1, and
VLC2 functions. Another pin can be used for normal I/O.
- When it is 1/4 bias, the P43/VLC0, P42/VLC1, P41/VLC2, and P40/VLC3 pins should be selected as VLC0,
VLC1, VLC2, and VLC3 functions
Figure 11.105 External Resistor Bias Connection
PS029902-0212
PRELIMINARY
267