参数资料
型号: MC68HC05F4CP
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 71/130页
文件大小: 2089K
代理商: MC68HC05F4CP
MC68HC05F4
MOTOROLA
5-1
CORE TIMER
5
CORE TIMER
The MC68HC05F4 has a 15-stage ripple counter called the core timer (CTIMER). Features of this
timer are: timer overow, power-on reset (POR), real time interrupt (RTI) with four selectable
interrupt rates and a computer operating properly (COP) watchdog timer.
Figure 5-1 Core timer block diagram
CTOF
RTIF
CTOFE
RTIE
RTOF RRTIF
RT1
RT0
COP watchdog
timer
(
÷ 8 )
To
reset
logic
Overow
detect
circuit
(
÷ 4 )
To interrupt logic
Interrupt circuit
RTI select circuit
$09 CTCR
(Core timer counter)
$08 CTCSR
(Core timer control and status)
COP
clear
Internal processor clock
7-bit counter
fOP
fOP / 2
2
fOP / 2
10
fOP / 2
14
fOP / 2
17
Internal bus
8
TPG
41
05F4Book Page 1 Tuesday, August 5, 1997 1:10 pm
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