HD404849 Datasheet, PDF (64/125 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404849 Series
Timer read register B (upper digit) (TRBU: $00B)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
Undefined Undefined Undefined Undefined
R
R
R
R
TRBU3 TRBU2 TRBU1 TRBU0
Figure 49 Timer Read Register B Upper Digit (TRBU)
• Port mode register C (PMRC: $025): Write-only register that selects R1₃/EVNB pin function as shown
in figure 50. It is reset to $0 by MCU reset.
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
Figure 50 Port Mode Register C (PMRC)
Timer C
Timer C Functions: Timer C has the following functions.
• Free-running/reload timer
• Watchdog timer
• Timer output operation (toggle, 0, 1, and PWM outputs)
The block diagram of timer C is shown in figure 51.
64