HD404374 Datasheet, PDF (102/161 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip A/D Converter

HD404374/HD404384/HD404389/HD404082/HD404084 Series
Port mode register 3 (PMR3: $00B):
Port mode register 3 (PMR3) has the following functions. See figure 61.
• R2₁/SCK pin selection
• R2₂/SI/SO pin selection
Port mode register 3 (PMR3) is a 4-bit write-only register used to select serial interface pin settings as
shown in figure 61. It is reset to $0 by an MCU reset.
Port mode register 3 (PMR3: $00B)
Bit
3
2
1
0
Read/Write
W
W
W
W
Initial value on reset 0
0
0
0
Bit name
PMR33 PMR32 PMR31 PMR30
PMR30 R20/TOC pin mode selection
0
R20
1 TOC
PMR31 R21/SCK pin mode selection
0
R21
1 SCK
PMR33 PMR32 R22/SI/SO pin mode selection
0
∗
R22
0 SI
1
1 SO
∗ : Don't care
Figure 61 Port Mode Register 3 (PMR3)
Rev.5.00, Sep.11.2003, page 102 of 161