NEC 78K0S/KA1+ User Manual page 134

(2) Port mode register 4 (PM4)
This register sets port 4 input/output in 1-bit units.
When using the P42/TOH1 pin for timer output, clear PM42 and the output latch of P42 to 0.
PM4 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets this register to FFH.
Address: FF24H After reset: FFH
Symbol 7
PM4 1
PM4n
0 Output mode (output buffer on)
1 Input mode (output buffer off)
134
CHAPTER 8 8-BIT TIMER H1
Figure 8-5. Format of Port Mode Register 4 (PM4)
R/W
6 5 4
1 PM45 PM44
P4n pin I/O mode selection (n = 0 to 5)
User's Manual U16898EJ3V0UD
3 2 1
PM43 PM42 PM41
0
PM40