HD404639R Datasheet, PDF (55/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer

Serial mode register 1A (SM1A: $005)
Bit
Initial value
Read/Write
Bit name
3
0
W
SM1A3
2
0
W
SM1A2
1
0
W
SM1A1
0
0
W
SM1A0
HD404639R Series
R4₁/SCK₁
SM1A3 mode selection
0
R4₁
1
SCK₁
SM1A2
0
SM1A1 SM1A0 SCK₁
0
0 Output
Clock source
Prescaler
Prescaler
division
ratio
÷2048
1 Output Prescaler
÷512
1
0 Output Prescaler
÷128
1 Output Prescaler
÷32
1
0
0 Output Prescaler
÷8
1 Output Prescaler
÷2
1
0 Output System clock —
1 Input External clock —
Figure 34 Serial Mode Register 1A (SM1A)
53