HD404849 Datasheet, PDF (54/127 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404849 Series
Port mode register C (PMRC: $025)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
0
0
0
0
W
W
W
W
PMRC3 PMRC2^* PMRC1 PMRC0
PMRC3
0
1
D₁₁/INT₀ mode selection
D₁₁
INT₀
PMRC1
0
1
R2₀/EVND mode selection
R2₀
EVND
PMRC2
0
1
D₁₀/STOPC mode selection
D₁₀
STOPC
PMRC0
0
1
R1₃/EVNB mode selection
R1₃
EVNB
Note: * PMRC2 is reset to 0 only by RESET input. When STOPC is input in stop
mode, PMRC2 is not reset but retains its value.
Figure 34 Port Mode Register C (PMRC)
Serial mode register A (SMRA: $005)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
0
0
0
0
W
W
W
W
SMRA3 SMRA2 SMRA1 SMRA0
R2₁/SCK
SMRA3 mode selection
0
R2₁
1
SCK
SMRA2 SMRA1 SMRA0 SCK Clock source
0
0
0 Output 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 35 Serial Mode Register A (SMRA)
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