參數(shù)資料
型號: MC68HC05X4CDW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Microcontroller Unit
中文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝: PLASTIC, SOIC-28
文件頁數(shù): 104/156頁
文件大?。?/td> 926K
代理商: MC68HC05X4CDW
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
0
RT1
RT0
COP watchdog
timer
(
÷
8 )
To
reset
logic
Overflow
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
f
OP
f
OP
/ 2
2
f
OP
/ 2
10
f
OP
/ 2
14
f
OP
/ 2
17
Internal bus
8
8
8
2-ctimer
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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