UPD78F1502AGK-GAK-AX Datasheet, PDF (480/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 14 SERIAL ARRAY UNIT
(14) Input switch control register (ISC)
ISC is used to realize a LIN-bus communication operation by UART3 in coordination with an external interrupt and
the timer array unit.
When bit 0 is set to 1, the input signal of the serial data input (RXD3) pin is selected as an external interrupt
(INTP0) that can be used to detect a wakeup signal.
When bit 1 is set to 1, the input signal of the serial data input (RXD3) pin is selected as a timer input, so that the
pulse widths of a sync break field and a sync field can be measured by the timer.
ISC can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 14-17. 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
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 7 to 5 to “0”.
Remark Bits 2 to 4 of ISC are not used with SAU1.
R01UH0004EJ0501 Rev.5.01
464
Jun 20, 2011