参数资料
型号: MC68HC05X4DWR2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封装: PLASTIC, SOIC-28
文件页数: 7/168页
文件大小: 656K
代理商: MC68HC05X4DWR2
Core Timer
MC68HC05X4 Rev 1.0
104
Core Timer
MOTOROLA
flags, are located in the CTIMER control and status register (CTCSR) at
location $08.
CTOF (core timer overflow flag) is a read-only status bit which is set
when the 8-bit ripple counter rolls over from $FF to $00. A CPU interrupt
request will be generated if CTOE is set. Clearing CTOF is done by
writing a ‘0’ to it . Writing a ‘1’ to CTOF has no effect on the bit’s value.
Reset clears CTOF.
Figure 1. Core timer block diagram
CTOF
RTIF
CTOE
RTIE
0
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 & 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
2-ctimer
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