参数资料
型号: MC68HC705CL16
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 1.802 MHz, MICROCONTROLLER, PQFP100
封装: TQFP-100
文件页数: 85/145页
文件大小: 673K
代理商: MC68HC705CL16
GENERAL RELEASE SPECIFICATION
June 11, 1997
MOTOROLA
RESETS
MC68HC05CL48
5-2
REV 2.0
5.3
COMPUTER OPERATING PROPERLY RESET (COPR)
The internal COPR reset is generated automatically (if enabled) by a time-out of
the COP Watchdog Timer. This time-out occurs if the counter in the COP
Watchdog Timer is not reset (cleared) within a specic time by a program reset
sequence. The COP Watchdog Timer can be enabled by setting bit 6 of the Option
Register at $001F. Refer to Section 8 for more information on this time-out
feature.
The COP Watchdog reset will activate the internal pulldown device connected to
the RESET pin for one cycle of the internal clock, PH2.
The COP register shares the same address ($FFF0) with the MS byte of the Core
Timer Interrupt Vector as shown below. Reading this location will return the MS
byte of the Core Timer Interrupt Vector. Writing $00 to this location clears the COP
watchdog timer.
76543210
COPR
$FFF0
READ
WRITE
COPR
POR
UUUUUUU
0
U = UNAFFECTED
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