UPD78F0411GA-GAM-AX Datasheet, PDF (352/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 14 SERIAL INTERFACE UART6
(7) Input switch control register (ISC)
By setting ISC5 to 1, the UART6 I/O pins are switched from P113/SEG7/RxD6 and P112/SEG6/TxD6 to
P12/RxD0/KR3/RxD6 and P13/TxD0/KR4/TxD6.
By setting ISC3 to 1, the P113/SEG7/RxD6 pin is enabled for input. When ISC3 is cleared to 0, external input is
not acknowledged. Thus, after release of reset, a generation of a through current due to an undetermined input
state until an output setting is performed is prevented.
The input switch control register (ISC) is used to receive a status signal transmitted from the master during LIN
(Local Interconnect Network) reception.
By setting ISC0 and ISC1 to 1, the input sources of INTP0 and TI000 are switched to input signals from the
P12/RxD0/KR3/RxD6 or P113/SEG7/RxD6 pin.
This register can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets this register to 00H.
Figure 14-11. Format of Input Switch Control Register (ISC)
Address: FF4FH After reset: 00H R/W
Symbol
7
6
5
ISC
0
0
ISC5
4
ISC4
3
ISC3
2
ISC2
1
ISC1
0
ISC0
ISC5
ISC4
0
0
1
0
Other than above
TxD6, RxD6 input source selection
TxD6:P112, RxD6: P113
TxD6:P13, RxD6: P12
Setting prohibited
ISC3
0
1
RxD6/P113 input enabled/disabled
RXD6/P113 input disabled
RXD6/P113 input enabled
ISC2
0
1
TI52 input source control
No enable control of TI52 input (P34)
Enable controlled of TI52 input (P34)^{Note 1}
ISC1
0
1
TI000 (P33)
RxD6 (P12 or P113^{Note 2})
TI000 input source selection
ISC0
0
1
INTP0 (P120)
RXD6 (P12 or P113^{Note 2})
INTP0 input source selection
Notes 1. TI52 input is controlled by TOH2 output signal.
2. TI000 and INTP0 input can be selected by ISC5 and ISC4.
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User’s Manual U18698EJ1V0UD