参数资料
型号: MC68HC05K0VDW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO16
封装: SOIC-16
文件页数: 135/154页
文件大小: 1544K
代理商: MC68HC05K0VDW
Multifunction Timer
Timer Counter Register
MC68HC05K0 MC68HC05K1 — Rev. 2.0
Technical Data
MOTOROLA
Multifunction Timer
81
8.4 Timer Counter Register
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 8-3.
Power-on clears the entire counter chain and begins clocking the
counter. After 4064 cycles, 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 allows a timer
interrupt every 1024 internal clock cycles.
Each count of the timer counter register takes eight oscillator cycles or
four cycles of the internal clock.
Address:
$0009
Bit 7
654321
Bit 0
Read:
TCR7
TCR6
TCR5
TCR4
TCR3
TCR2
TCR1
TCR0
Write:
Reset:
00000000
= Unimplemented
Figure 8-3. Timer Counter Register (TCNTR)
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