HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 614

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 13 Watchdog Timer
13.2
13.2.1
TCNT is an 8-bit readable/writable *
When the TME bit is set to 1 in TCSR, TCNT starts counting pulses generated from the internal
clock source selected by bits CKS2 to CKS0 in TCSR. When the count overflows (changes from
H'FF to H'00), either the watchdog timer overflow signal (WDTOVF) *
interrupt (WOVI) is generated, depending on the mode selected by the WT/IT bit in TCSR.
TCNT is initialized to H'00 by a reset, in hardware standby mode, or when the TME bit is cleared
to 0. It is not initialized in software standby mode.
Notes: 1. TCNT is write-protected by a password to prevent accidental overwriting. For details
Rev.6.00 Sep. 27, 2007 Page 584 of 1268
REJ09B0220-0600
Bit
Initial value :
R/W
2. The WDTOVF pin function cannot be used in the F-ZTAT versions.
Register Descriptions
Timer Counter (TCNT)
see section 13.2.4, Notes on Register Access.
:
:
R/W
7
0
R/W
6
0
1
up-counter.
R/W
5
0
R/W
4
0
R/W
3
0
R/W
2
or an interval timer
2
0
R/W
1
0
R/W
0
0