UPD78F1502AGK-GAK-AX Datasheet, PDF (690/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 16 LCD CONTROLLER/DRIVER
(7) Input switch control register (ISC)
The segment output pins to be used alternatively with the TI04, TI02, and RxD3 pins are internally connected with
a Schmitt trigger buffer. To use these pins as segment outputs, input to the Schmitt trigger buffer must be
disabled, in order to prevent through-currents from entering.
ISC is set using a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets ISC to 00H.
Remark
The segment output pins to be used alternatively with the TI02, TI04, and RxD3 pins vary, depending
on the product.
• 78K0R/LF3:
TI04/SEG27/P53, TI02/SEG28/P52, RxD3/SEG30/P50
• 78K0R/LG3:
TI04/SEG36/P53, TI02/SEG37/P52, RxD3/SEG39/P50
• 78K0R/LH3:
TI04/SEG50/P53, TI02/SEG51/P52, RxD3/SEG53/P50
Figure 16-8. Format of Input Switch Control Register (ISC)
Address: FFF3CH After reset: 00H R/W
Symbol
7
6
5
ISC
0
0
0
4
ISC4
3
ISC3
2
ISC2
1
ISC1
0
ISC0
ISC4
0
1
Disables input
Enables input
TI04/SEGxx/P53 schmitt trigger buffer control
ISC3
0
1
Disables input
Enables input
TI02/SEGxx/P52 schmitt trigger buffer control
ISC2
0
1
Disables input
Enables input
RxD3/SEGxx/P50 schmitt trigger buffer control
Caution Be sure to clear bits 5 to 7 to “0”.
Remark Bits 0 and 1 of ISC are not used with the LCD controller driver.
To use the TI04/SEGxx/P53, TI02/SEGxx/P52, and RxD3/SEGxx/P50 pins, set the PF5L and ISCn (n = 2 to 4)
bits as follows, according to the function to be used.
PF5L
0
0
1
1
ISCn
0
1
0
1
Pin function
Port output (default)
Port input, timer input, or serial data input
Segment output
Setting prohibited
R01UH0004EJ0501 Rev.5.01
674
Jun 20, 2011