h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 428

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 Watchdog Timer (WDT)
15.3.2
TCSR selects the clock source to be input to TCNT, and the timer mode.
• TCSR_0
Rev. 3.00 Jan 25, 2006 page 376 of 872
REJ09B0286-0300
Bit
7
6
5
4
3
Bit Name Initial Value R/W
OVF
WT/IT
TME
—
RST/NMI
Timer Control/Status Register (TCSR)
0
0
0
0
0
R/(W) * Overflow Flag
R/W
R/W
R/(W)
R/W
Description
Indicates that TCNT has overflowed (changes from H'FF
to H'00).
[Setting condition]
When internal reset request generation is selected in
watchdog timer mode, OVF is cleared automatically by
the internal reset.
[Clearing conditions]
Timer Mode Select
Selects whether the WDT is used as a watchdog timer
or interval timer.
0: Interval timer mode
1: Watchdog timer mode
Timer Enable
When this bit is set to 1, TCNT starts counting.
When this bit is cleared, TCNT stops counting and is
initialized to H'00.
Reserved
The initial value should not be changed.
Reset or NMI
Selects to request an internal reset or an NMI interrupt
when TCNT has overflowed.
0: An NMI interrupt is requested
1: An internal reset is requested
When TCNT overflows (changes from H'FF to H'00)
When TCSR is read when OVF = 1, then 0 is written
to OVF
When 0 is written to TME