參數(shù)資料
型號: MC68HC05C9AMB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP42
封裝: PLASTIC, SDIP-42
文件頁數(shù): 127/162頁
文件大小: 1093K
代理商: MC68HC05C9AMB
Capture/Compare Timer
Timer I/O Registers
MC68HC05C9A Rev. 5.0
Advance Information
MOTOROLA
Capture/Compare Timer
67
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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