Datasheet

78K0/Ix2 CHAPTER 9 8-BIT TIMER H1
R01UH0010EJ0500 Rev.5.00 340
Feb 28, 2012
(4) Port mode registers 0 and 3 (PM0, PM3)
These registers set ports 0 and 3 input/output in 1-bit units.
PM0 and PM3 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets these registers to FFH.
 78K0/IY2
When using the <TOH1>/P34/TOX11/<TI51>/INTP4 pin for timer output, clear PM34 and the output latch of P34 to 0
.
 78K0/IA2, 78K0/IB2 (32 pins)
When using the <TOH1>/P00/TI00/<TI51>/INTP0 and <TOH1>/P34/TOX11/<TI51>/INTP4 pins for timer output, clear
PM00 and PM34, and the output latches of P00 and P34 to 0.
 78K0/IB2 (30 pins)
When using the TOH1/P30/TI51/INTP1 pin for timer output, clear PM30 and the output latch of P30 to 0
.
Figure 9-7. Format of Port Mode Register 0 (PM0)
Address: FF20H After reset: FFH R/W
Symbol 7 6 5 4 3 2 1 0
PM0 1 1 1 1 1 1 1 PM00
PM00 P00 pin I/O mode selection
0 Output mode (output buffer on)
1 Input mode (output buffer off)
Remark The figure shown above presents the format of port mode register 0 of the 78K0/IA2.
Figure 9-8. Format of Port Mode Register 3 (PM3)
Address: FF23H After reset: FFH R/W
Symbol 7 6 5 4 3 2 1 0
PM3 PM37 PM36 PM35 PM34 PM33 PM32 PM31 PM30
PM3n P3n pin I/O mode selection (n = 0 to 7)
0 Output mode (output buffer on)
1 Input mode (output buffer off)
Remark The figure shown above presents the format of port mode register 3 of the 78K0/IB2 (30 pins).
For the format of port mode register 3 of other products, refer to (1) Port mode registers
(PMxx) in 4.3 Registers Controlling Port Function.