Datasheet

RL78/L12 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0330EJ0200 Rev.2.00 405
Dec 13, 2013
Figure 12-18. Interrupt in UART Reception Operation in SNOOZE Mode
EOCmn Bit SSECm Bit Reception Ended Successfully Reception Ended in an Error
0 0 INTSRx is generated. INTSRx is generated.
0 1 INTSRx is generated. INTSRx is generated.
1 0 INTSRx is generated. INTSREx is generated.
1 1 INTSRx is generated. No interrupt is generated.
12.3.15 Input switch control register (ISC)
The ISC1 and ISC0 bits of the ISC register are used to realize a LIN-bus communication operation by UART0 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 (R
XD0) 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 (R
XD0) pin is selected as a timer input, so that wake up
signal can be detected, the low width of the break field, and the pulse width of the sync field can be measured by the timer.
The ISC register can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears the ISC register to 00H.
Figure 12-19. Format of Input Switch Control Register (ISC)
Address: F0073H After reset: 00H R/W
Symbol 7 6 5 4 3 2 1 0
ISC 0 0 0 0 0 0 ISC1 ISC0
ISC1 Switching channel 5 input of timer array unit
0 52 and 64-pin products:
Uses the input signal of the TI05 pin as a timer input (normal operation).
32, 44, 48-pin products:
Do not use a timer input signal for channel 5.
1
Input signal of the R
XD0 pin is used as timer input (detects the wakeup signal and measures the low
width of the break field and the pulse width of the sync field).
ISC0 Switching external interrupt (INTP0) input
0 Uses the input signal of the INTP0 pin as an external interrupt (normal operation).
1 Uses the input signal of the RXD0 pin as an external interrupt (wakeup signal detection).
Caution Be sure to clear bits 7 to 2 to “0”.
<R>