HD6412350 Hitachi, HD6412350 Datasheet - Page 911
HD6412350
Manufacturer Part Number
HD6412350
Description
(HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6412350.pdf
(989 pages)
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TCSR—Timer Control/Status Register
Bit
Initial value
Read/Write
The method for writing to TCSR is different from that for general registers to prevent accidental overwriting.
For details see section 12.2.4, Notes on Register Access.
Note: * Can only be written with 0 for flag clearing.
:
:
:
Overflow Flag
R/(W)*
OVF
0
1
7
0
[Clearing condition]
Cleared by reading TCSR when OVF = 1, then writing 0 to OVF
[Setting condition]
Set when TCNT overflows from H'FF to H'00 in interval timer mode
Timer Mode Select
WT/IT
R/W
0
1
6
0
Interval timer mode: Sends the CPU an interval timer interrupt request
(WOVI) when TCNT overflows
Watchdog timer mode: Generates the WDTOVF signal when
TCNT overflows
Timer Enable
TME
R/W
0
1
5
0
TCNT is initialized to H'00 and halted
TCNT counts
—
—
4
1
Note: *
CKS2 CKS1 CKS0
Clock Select
—
—
3
1
0
1
H'FFBC (W) H'FFBC (R)
The overflow period is the time from when TCNT
starts counting up from H'00 until overflow occurs.
0
1
0
1
CKS2
R/W
2
0
0
1
0
1
0
1
0
1
ø/2 (initial value)
ø/64
ø/128
ø/512
ø/2048
ø/8192
ø/32768
ø/131072
CKS1
R/W
Clock
1
0
CKS0
R/W
0
0
(when ø = 20 MHz)
25.6 s
819.2 s
1.6ms
6.6ms
26.2ms
104.9ms
419.4ms
1.68s
Overflow period*
WDT
891
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