NEC 78K0S/KA1+ Preliminary User's Manual page 188

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(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. The input signal is switched by setting ISC.
This register can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset input clears this register to 00H.
Address: FF8CH
Symbol
ISC
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(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 input sets this register to FFH.
Address: FF24H
Symbol
PM4
188
CHAPTER 11 SERIAL INTERFACE UART6
Figure 11-11. Format of Input Switch Control Register (ISC)
After reset: 00H R/W
7 6 5
0 0 0
ISC1
0 TI000 (P30)
1 RxD6 (P44)
ISC0
0 INTP0 (P30)
1 RxD6 (P44)
Figure 11-12. Format of Port Mode Register 4 (PM4)
After reset: FFH R/W
7 6 5
1 1 PM45
PM4n P4n pin I/O mode selection (n = 0 to 5)
0 Output mode (output buffer on)
1 Input mode (output buffer off)
Preliminary User's Manual U16898EJ1V0UD
4 3
0 0
TI000 input source selection
INTP0 input source selection
4 3 2
PM44 PM43 PM42
2 1 0
0 ISC1 ISC0
1 0
PM41 PM40