HD404654 Datasheet, PDF (64/111 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404654 Series
Port mode register C (PMRC: $025)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
0
0
0
—
W
W
W
—
PMRC3 PMRC2 PMRC1 Not used
PMRC1
0
1
R4₀/EVND mode selection
R4₀
EVND
PMRC2
0
1
D₁₂/STOPC mode selection
D₁₂
STOPC
PMRC3
0
1
D₁₃/INT₀ mode selection
D₁₃
INT₀
Figure 50 Port Mode Register C (PMRC)
• Detection edge select register 2 (ESR2: $027): Write-only register that selects the detection edge of
signals input to pin EVND as shown in figure 51. It is reset to $0 by MCU reset.
Detection edge register 2 (ESR2: $027)
Bit
Initial value
Read/Write
Bit name
3
0
W
ESR23
2
1
0
0
—
—
W
—
—
ESR22 Not used Not used
ESR23 ESR22 EVND detection edge
0
0
No detection
1
Falling-edge detection
1
0
Rising-edge detection
1
Double-edge detection ^*
Note: ^* Both falling and rising edges are detected.
Figure 51 Detection Edge Select Register 2 (ESR2)
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