h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 258

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

11.3.2
TCSR selects the clock source to be input to TCNT, and the timer mode.
• TCSR_0
Rev. 1.00, 05/04, page 224 of 544
Bit
7
6
5
4
3
Bit Name
WT/IT
OVF
TME
—
RST/NMI
Timer Control/Status Register (TCSR)
0
Initial
Value
0
0
0
0
R/W
R/(W)*
R/W
R/W
R/(W)
R/W
1
Description
Overflow Flag
Indicates that TCNT has overflowed (changes from
H'FF to H'00).
[Setting condition]
When TCNT overflows (changes from H'FF to H'00)
However, 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 modified.
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 TCSR is read when OVF = 1*
written to OVF
When 0 is written to TME
2
, then 0 is