UPD78F1502AGK-GAK-AX Datasheet, PDF (212/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 4 PORT FUNCTIONS
Figure 4-51. 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
ISC1
0
1
Switching channel 7 input of timer array unit
Uses the input signal of the TI07 pin as a timer input (normal operation).
Input signal of RXD3 pin is used as timer input (wakeup signal detection).
ISC0
0
1
Switching external interrupt (INTP0) input
Uses the input signal of the INTP0 pin as an external interrupt (normal operation).
Uses the input signal of the RXD3 pin as an external interrupt
(to measure the pulse widths of the sync break field and sync field).
Caution Be sure to clear bits 5 to 7 to “0”.
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
196
Jun 20, 2011