UPD78F9234MC-5A4-A Datasheet, PDF (199/419 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 11 SERIAL INTERFACE UART6
(7) Input switch control register (ISC)
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 1 to ISC0 and ISC1, the input source to INTP0 and TI000 switches to the input signal from the
P44/RxD6 pin.
This register can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 11-11. Format of Input Switch Control Register (ISC)
Address: FF8CH After reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
ISC
0
0
0
0
0
0
ISC1
ISC0
ISC1
0
1
TI000 (P30)
RxD6 (P44)
TI000 input source selection
ISC0
0
1
INTP0 (P30)
RxD6 (P44)
INTP0 input source selection
(8) Port mode register 4 (PM4)
This register sets port 4 input/output in 1-bit units.
When using the P43/TxD6/INTP1 pin for serial interface data output, clear PM43 to 0 and set the output latch of
P43 to 1.
When using the P44/RxD6 pin for serial interface data input, set PM44 to 1. The output latch of P44 at this time
may be 0 or 1.
PM4 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets this register to FFH.
Figure 11-12. Format of Port Mode Register 4 (PM4)
Address: FF24H After reset: FFH R/W
Symbol
7
6
5
PM4
PM47
PM46
PM45
4
PM44
3
PM43
2
PM42
1
PM41
0
PM40
PM4n
0
1
P4n pin I/O mode selection (n = 0 to 7)
Output mode (output buffer on)
Input mode (output buffer off)
User’s Manual U17446EJ5V0UD
197