HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 346

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

• Bit 7 (watchdog timer overflow (WOVF)): WOVF indicates that the TCNT has overflowed
Bit 7: WOVF
0
1
• Bit 6 (reset enable (RSTE)): RSTE selects whether to reset the chip internally if the TCNT
Bit 6: RSTE
0
1
• Bit 5 (reset select (RSTS)): RSTS selects the type of internal reset generated if the TCNT
Bit 5: RSTS
0
1
• Bits 4–0 (reserved): These bits always read as 1. The write value should always be 1.
HITACHI 332
(H'FF
overflows in the watchdog timer mode.
overflows in the watchdog timer mode.
H'00) in the watchdog timer mode. It is not set in the interval timer mode.
Description
No TCNT overflow in watchdog timer mode (initial value)
Cleared when software reads WOVF, then writes 0 in WOVF
Set by TCNT overflow in watchdog timer mode
Description
Not reset when TCNT overflows (initial value). LSI not reset internally,
but TCNT and TCSR reset within WDT.
Reset when TCNT overflows
Description
Power-on reset initial value)
Manual reset