CHAPTER 11 SERIAL INTERFACE UART6
User’s Manual U17446EJ3V1UD
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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.
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
TI000 input source selection
0
TI000
(P30)
1
RxD6
(P44)
ISC0
INTP0 input source selection
0
INTP0
(P30)
1
RxD6
(P44)
(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 4 3 2 1 0
PM4
PM47 PM46 PM45 PM44 PM43 PM42 PM41 PM40
PM4n
P4n pin I/O mode selection (n = 0 to 7)
0
Output mode (output buffer on)
1
Input mode (output buffer off)