參數(shù)資料
型號: MC68HC901FN
廠商: MOTOROLA INC
元件分類: 外設(shè)及接口
英文描述: Multi-Function Peripheral
中文描述: MULTIFUNCTION PERIPHERAL, PQCC52
封裝: PLASTIC, LCC-52
文件頁數(shù): 42/73頁
文件大?。?/td> 274K
代理商: MC68HC901FN
Timers
6-5
MC68HC901 USER’S MANUAL
MOTOROLA
Bits 7-5 — *Unused
Unused bits read as zero.
Reset TAO/TBO — Reset Timer A and B Output
TAO and TBO may be forced low at any time by writing a one to the reset location in TACR
and TBCR. Output is held low during the write operation, and at the end of the bus cycle the
output is allowed to toggle in response to a time-out pulse. When resetting TAO and TBO,
the other bits in the TCR must be written with their previous value to avoid altering the
operating mode.
AC3-AC0/BC3-BC0 — Select Timer A and B Operation Mode
When the timer is stopped, counting is inhibited. The contents of the timer’s main counter
are not affected, although any residual count in the prescaler is lost.
TACR REGISTER
BIT
7
6
5
4
3
2
1
0
FIELD
*
*
*
RESET
TAO
AC3
AC2
AC1
AC0
RESET
0
0
0
0
0
0
0
0
ADDR
$19
TBCR REGISTER
BIT
7
6
5
4
3
2
1
0
FIELD
*
*
*
RESET
TBO
BC3
BC2
BC1
BC0
RESET
0
0
0
0
0
0
0
0
ADDR
$1B
AC3
BC3
AC2
BC2
AC1
BC1
AC0
BC0
OPERATION MODE
0
0
0
0
Timer Stopped
0
0
0
1
Delay Mode,
÷
4 Prescaler
0
0
1
0
Delay Mode,
÷
10 Prescaler
0
0
1
1
Delay Mode,
÷
16 Prescaler
0
1
0
0
Delay Mode,
÷
50 Prescaler
0
1
0
1
Delay Mode,
÷
64 Prescaler
0
1
1
0
Delay Mode,
÷
100 Prescaler
0
1
1
1
Delay Mode,
÷
200 Prescaler
1
0
0
0
Event Count Mode
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