HD6432621 Hitachi, HD6432621 Datasheet - Page 995

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

TCNT0—Timer Counter 0
RSTCSR—Reset Control/Status Register
Notes: RSTCSR is write-protected by a password to prevent accidental overwriting. For details
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
Note: TCNT is write-protected by a password to prevent accidental overwriting. For details see
section 12.2.5, Notes on register access.
see section 12.2.5, Notes on register access.
* Can only be written with 0 for flag clearing.
:
:
:
:
:
:
Watchdog overflow flag
0 [Clearing condition]
1
R/(W)*
WOVF
When 0 is written to WOVF after reading TCSR when WOVF = 1
[Setting condition]
When TCNT overflows (changes from H'FF to H'00) in watchdog timer mode
R/W
7
0
7
0
Reset enable
Note: * The modules within the chip are not reset, but TCNT and
RSTE
0 Internal reset is not performed when TCNT overflows*
1
R/W
R/W
6
0
6
0
Internal reset is performed when TCNT overflows
TCSR within the WDT are reset.
RSTS
Reset select
R/W
R/W
0 Power-on reset
1
5
0
5
0
Setting prohibited
R/W
—
—
4
1
4
0
H'FF74 (W), H'FF75 (R)
H'FF76 (W), H'FF77 (R)
R/W
—
—
3
1
3
0
R/W
—
—
2
1
2
0
R/W
—
—
1
1
1
0
R/W
—
—
0
1
0
0
WDT
WDT
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