HD6473032F16 Datasheet, PDF (455/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

12.2 Register Descriptions
Section 12 Watchdog Timer
12.2.1 Timer Counter (TCNT)
TCNT is an 8-bit readable and writable* up-counter.
Bit
7
6
5
4
3
2
1
0
Initial value
Read/Write
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
When the TME bit is set to 1 in TCSR, TCNT starts counting pulses generated from an internal
clock source selected by bits CKS2 to CKS0 in TCSR. When the count overflows (changes from
H'FF to H'00), the OVF bit is set to 1 in TCSR. TCNT is initialized to H'00 by a reset and when
the TME bit is cleared to 0.
Note: * TCNT is write-protected by a password. For details see section 12.2.4, Notes on Register
Access.
Rev. 3.00 Mar 21, 2006 page 425 of 814
REJ09B0302-0300