参数资料
型号: MC68HC705J2CP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP20
封装: PLASTIC, DIP-20
文件页数: 39/82页
文件大小: 2545K
代理商: MC68HC705J2CP
TIMER
7-2
Rev. 2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
7.1 Timer Counter Register (TCR)
A 15-stage ripple counter is the core of the timer. The value of the first eight stages
is readable at any time from the read-only timer counter register shown in Figure
Figure 7-2. Timer Counter Register (TCR)
Power-on clears the entire counter chain and begins clocking the counter. After
4064 cycles of the internal clock, the power-on reset circuit is released, clearing the
counter again and allowing the MCU to come out of reset.
A timer overflow function at the eighth counter stage makes timer interrupts
possible every 1024 internal clock cycles.
7.2 Timer Control and Status Register (TCSR)
Timer interrupt flags, timer interrupt enable bits, and real-time interrupt rate select
bits are in the read/write timer control and status register.
Figure 7-3. Timer Control and Status Register (TCSR)
TCR — Timer Counter Register
$0009
Bit 7
6
5
4
3
2
1
Bit 0
RESET
0
TCSR — Timer Control and Status Register
$0008
Bit 7
6
5
4
3
2
1
Bit 0
TOF
RTIF
TOIE
RTIE
0
RT1
RT0
RESET
0
1
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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