
459
•
Bit 5—Timer Enable (TME): Enables or disables the timer.
Bit 5: TME
Description
0
Timer disabled: TCNT is initialized to H'00 and count-up stops (initial
value)
1
Timer enabled: TCNT starts counting. A
WDTOVF
signal or interrupt is
generated when TCNT overflows.
•
Bits 4 and 3—Reserved: These bits always read as 1. The write value should always be 1.
•
Bits 2–0: Clock Select 2–0 (CKS2–CKS0): These bits select one of eight internal clock sources
for input to the TCNT. The clock signals are obtained by dividing the frequency of the system
clock (
φ
).
Description
Bit 2: CKS2 Bit 1: CKS1
Bit 0: CKS0
Clock Source
Overflow Interval
*
(
φ
= 28.7 MHz)
0
0
0
φ
/2 (initial value)
17.9 µs
0
0
1
φ
/64
573.4 µs
0
1
0
φ
/128
1.1 ms
0
1
1
φ
/256
2.3 ms
1
0
0
φ
/512
4.6 ms
1
0
1
φ
/1024
9.2 ms
1
1
0
φ
/4096
36.7 ms
1
1
1
φ
/8192
73.4 ms
Note:
*
The overflow interval listed is the time from when the TCNT begins counting at H'00 until
an overflow occurs.
Содержание SH7041 Series
Страница 2: ......
Страница 6: ......
Страница 38: ...xvi ...
Страница 44: ...6 ...
Страница 46: ...8 ...
Страница 48: ...10 ...
Страница 82: ...44 ...
Страница 114: ...76 ...
Страница 118: ...80 ...
Страница 124: ...86 ...
Страница 170: ...132 ...
Страница 250: ...212 ...
Страница 492: ...454 ...
Страница 506: ...468 ...
Страница 604: ...566 ...
Страница 684: ...646 ...
Страница 706: ...668 ...
Страница 778: ...740 ...
Страница 780: ...742 ...
Страница 818: ...780 ...
Страница 850: ...812 ...
Страница 923: ...SH7040 SH7041 SH7042 SH7043 SH7044 SH7045 Group Hardware Manual REJ09B0044 0600O ...