参数资料
型号: MC68HC05V7FNR2
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, PQCC68
封装: PLASTIC, LCC-68
文件页数: 163/170页
文件大小: 589K
代理商: MC68HC05V7FNR2
MOTOROLA
SECTION 12: CORE TIMER
Page 78
MC68HC05V7 Specification Rev. 1.0
12.3
CORE TIMER COUNTER REGISTER (CTCR) $09
The Timer Counter Register is a read-only register which contains the current value of the
8-bit ripple counter at the beginning of the timer chain. This counter is clocked by the CPU
clock (E/4) and can be used for various functions including a software input capture.
Extended time periods can be attained using the TOF function to increment a temporary
RAM storage location thereby simulating a 16-bit (or more) counter.
Figure 12-3:
Timer Counter Register
The power-on cycle clears the entire counter chain and begins clocking the counter. After
4064 cycles, the power-on reset circuit is released which again clears the counter chain and
allows the device to come out of reset. At this point, if RESET is not asserted, the timer will
start counting up from zero and normal device operation will begin. When RESET is
asserted anytime during operation (other than POR), the counter chain will be cleared.
12.4
TIMER DURING WAIT MODE
The CPU clock halts during the WAIT mode, but the timer remains active. If interrupts are
enabled, a timer interrupt will cause the processor to exit the WAIT mode. The COP is
always enabled while in user mode.
D7
D5
D4
D3
D2
D1
D0
D6
$09
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