参数资料
型号: MC68HC05C9EFB
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封装: QFP-44
文件页数: 107/144页
文件大小: 1628K
代理商: MC68HC05C9EFB
Capture/Compare Timer
Timer I/O Registers
MC68HC05C9E
Advance Information
MOTOROLA
Capture/Compare Timer
65
N
O
N-D
I
SC
L
O
SU
R
E
AG
R
EEMENT
R
E
Q
U
IR
ED
8.4.3 Timer Registers
The timer registers (TRH and TRL), shown in Figure 8-4, contain the
current high and low bytes of the 16-bit counter. Reading TRH before
reading TRL causes TRL to be latched until TRL is read. Reading TRL
after reading the timer status register clears the timer overflow flag
(TOF). Writing to the timer registers has no effect.
Figure 8-4. Timer Registers (TRH and TRL)
Address:
$0018 — TRH
Bit 7
6
54
32
1
Bit 0
Read:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Write
Reset:
11
Address:
$0019 — TRL
Bit 7
6
54
32
1
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
11
00
= Unimplemented
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