参数资料
型号: MC68HC705J1AVS
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER, CDIP20
封装: WINDOWED, CERAMIC, DIP-20
文件页数: 15/162页
文件大小: 3213K
代理商: MC68HC705J1AVS
Multifunction Timer Module
Operation
MC68HC705J1A — Rev. 4.0
Technical Data
Multifunction Timer Module
9.3 Operation
A 15-stage ripple counter, preceded by a prescaler that divides the
internal clock signal by four, provides the timing reference for the timer
functions. The value of the first eight timer stages can be read at any
time by accessing the timer counter register at address $0009. A timer
overflow function at the eighth stage allows a timer interrupt every 1024
internal clock cycles.
The next four stages lead to the real-time interrupt (RTI) circuit. The RT1
and RT0 bits in the timer status and control register at address $0008
allow a timer interrupt every 16,384, 32,768, 65,536, or 131,072 clock
cycles. The last four stages drive the selectable COP system. For
information on the COP, refer to the Section 7. Computer Operating
Addr.
Register Name
Bit 7
654321
Bit 0
$0008
Timer Status and Control
Register (TSCR)
Read:
TOF
RTIF
TOIE
RTIE
00
RT1
RT0
Write:
TOFR
RTIFR
Reset:
00
000011
$0009
Timer Counter Register
(TCR)
Read:
TMR7
TMR6
TMR5
TMR4
TMR3
TMR2
TMR1
TMR0
Write:
Reset:
00
000000
= Unimplemented
Figure 9-2. I/O Register Summary
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For More Information On This Product,
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