Section 13 Watchdog Timer (WDT)
Rev. 2.00 Mar 09, 2006 page 547 of 906
REJ09B0292-0200
Bit 5—Timer Enable (TME): Enables or disables the timer.
Bit 5: TME
Description
0
Timer disabled: WTCNT is initialized to H'00 and count-up stops
(Initial value)
1
Timer enabled: WTCNT starts counting. A
WDTOVF
signal or interrupt
is generated when WTCNT overflows
Bits 4 and 3—Reserved: These bits are always read as 1. The write value should always be 1.
Bits 2 to 0—Clock Select 2 to 0 (CKS2 to CKS0): These bits select one of eight internal clock
sources for input to WTCNT. The clock signals are obtained by dividing the frequency of the
system clock (
φ
).
Description
Bit 2: CKS2 Bit 1: CKS1 Bit 0: CKS0 Clock Source
Overflow Interval
*
(
φφφφ
= 60 MHz)
0
0
0
φ
/4 (Initial value)
17.0 µs
1
φ
/128
544 µs
1
0
φ
/256
1.1 ms
1
φ
/512
2.2 ms
1
0
0
φ
/1024
4.4 ms
1
φ
/2048
8.7 ms
1
0
φ
/8192
34.8 ms
1
φ
/16384
69.6 ms
Note:
*
The overflow interval listed is the time from when the WTCNT begins counting at H'00 until
an overflow occurs.
13.2.3
Reset Control/Status Register (RSTCSR)
Bit:
7
6
5
4
3
2
1
0
WOVF
RSTE
RSTS
—
—
—
—
—
Initial value:
0
0
0
1
1
1
0
1
R/W:
R/(W)
*
R/W
R/W
R
R
R
R
R
Note:
*
Only 0 can be written in bit 7, to clear the flag.
RSTCSR is an 8-bit read/write register that controls output of the reset signal generated by
watchdog timer counter (WTCNT) overflow and selects the internal reset signal type. The method
Summary of Contents for SH7616
Page 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Page 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Page 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Page 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Page 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Page 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Page 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Page 935: ...SH7616 Hardware Manual ...