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H8/3028F 数据表(PDF) 408 Page - Renesas Technology Corp

部件名 H8/3028F
功能描述  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
PDF  923 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8/3028F 数据表(HTML) 408 Page - Renesas Technology Corp

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Rev. 2.00, 09/03, page 378 of 890
10.2
Register Descriptions
10.2.1
Timer Counters (8TCNT)
15
0
R/W
Bit
Initial value
Read/Write
14
0
R/W
Bit
Initial value
Read/Write
13
0
R/W
12
0
R/W
11
0
R/W
10
0
R/W
9
0
R/W
8
0
R/W
7
0
R/W
6
0
R/W
5
0
R/W
4
0
R/W
3
0
R/W
2
0
R/W
1
0
R/W
0
0
R/W
8TCNT0
8TCNT1
15
0
R/W
14
0
R/W
13
0
R/W
12
0
R/W
11
0
R/W
10
0
R/W
9
0
R/W
8
0
R/W
7
0
R/W
6
0
R/W
5
0
R/W
4
0
R/W
3
0
R/W
2
0
R/W
1
0
R/W
0
0
R/W
8TCNT2
8TCNT3
The timer counters (8TCNT) are 8-bit readable/writable up-counters that increment on pulses
generated from an internal or external clock source. The clock source is selected by clock select
bits 2 to 0 (CKS2 to CKS0) in the timer control register (8TCR). The CPU can always read or
write to the timer counters.
The 8TCNT0 and 8TCNT1 pair, and the 8TCNT2 and 8TCNT3 pair, can each be accessed as a
16-bit register by word access.
8TCNT can be cleared by an input capture signal or compare match signal. Counter clear bits 1
and 0 (CCLR1 and CCLR0) in 8TCR select the method of clearing.
When 8TCNT overflows from H'FF to H'00, the overflow flag (OVF) in the timer control/status
register (8TCSR) is set to 1.
Each 8TCNT is initialized to H'00 by a reset and in standby mode.



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