Rev. 1.0, 09/02, page 286 of 568
13.2.3
Reset Control/Status Register (RSTCSR)
RSTCSR is an 8-bit readable/writable register that controls the generation of the internal reset
signal when TCNT overflows, and selects the type of internal reset signal. RSTCSR is initialized
to H
′
1F by a reset signal from the
RES
pin, and not by the WDT internal reset signal caused by
overflows.
Bit
Bit Name
Initial Value
R/W
Description
7 WOVF
0
R/(W)
*
Watchdog Overflow Flag
This bit is set when TCNT overflows in watchdog
timer mode. This bit cannot be set in interval timer
mode, and only 0 can be written.
[Setting condition]
Set when TCNT overflows (changed from H
′
FF to
H
′
00) in watchdog timer mode
[Clearing condition]
Cleared by reading RSTCSR when WOVF = 1,
and then writing 0 to WOVF
6 RSTE
0
R/W Reset
Enable
Specifies whether or not a reset signal is
generated in the chip if TCNT overflows during
watchdog timer operation.
0: Reset signal is not generated even if TCNT
overflows
(Though this LSI is not reset, TCNT and TCSR in
WDT are reset)
1: Reset signal is generated if TCNT overflows
5 RSTS
0
R/W Reset
Select
Selects the type of internal reset generated if
TCNT overflows during watchdog timer operation.
0: Power-on reset
1: Setting prohibited
4 to
0
All
1
Reserved
These bits are always read as 1 and cannot be
modified.
Note:
*
Only 0 can be written, for flag clearing.
Summary of Contents for H8S/2627
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