HD6432646 Hitachi, HD6432646 Datasheet - Page 1064

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

TCNT0—Timer Counter 0
RSTCSR—Reset Control/Status Register
1030
Bit
Initial value
Read/Write
Note: * Can only be written with 0 for flag clearing.
Bit
Initial value
Read/Write
Note: TCNT is write-protected by a password to prevent accidental overwriting.
For details see section 12.2.4, Notes on Register Access.
Watchdog Overflow Flag
RSTCSR is write-protected by a password to prevent accidential overwriting.
For details see section 12.2.4, Notes on Register Access.
0
1
[Clearing condition]
Cleared by reading TCSR when WOVF = 1, then writing 0 to WOVF
[Setting condition]
Set when TCNT overflows (changed from H'FF to H'00) during watchdog timer
operation
R/(W)*
WOVF
R/W
7
0
7
0
Note: * The modules within the H8S/2646 are not reset,
Reset Enable
RSTE
R/W
R/W
0
1
6
0
6
0
Reset signal is not generated if TCNT overflows*
Reset signal is generated if TCNT overflows
but TCNT and TCSR within the WDT are reset.
R/W
5
0
—
—
5
0
R/W
4
0
Up-counter
—
—
4
1
H'FF74(W), H'FF75(R)
H'FF76(W), H'FF77(R)
R/W
3
0
—
—
3
1
R/W
—
—
2
0
2
1
R/W
1
0
—
—
1
1
R/W
—
0
0
—
0
1
WDT0
WDT0