参数资料
型号: MC68HC705CT4FN
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.048 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, LCC-44
文件页数: 136/152页
文件大小: 668K
代理商: MC68HC705CT4FN
NON-DISCLOSURE
AGREEMENT
REQUIRED
Core Timer
General Release Specification
MC68HC705CT4 Rev. 2.0
84
Core Timer
MOTOROLA
10.5 Computer Operating Properly (COP) Reset
The COP watchdog timer function is implemented on this device by
using the output of the RTI circuit and further dividing it by eight. The
minimum COP reset rates are listed in Table 10-2. If the COP circuit
times out, an internal reset is generated and the normal reset vector is
fetched. Preventing a COP timeout or clearing the COP is accomplished
by writing a logic 0 to bit 0 of address $1FF0. When the COP is cleared,
only the final divide-by-eight stage (output of the RTI) is cleared.
If the COP watchdog timer is allowed to time out, an internal reset is
generated to reset the MCU. In addition, the RESET pin is pulled low for
a minimum of one E-clock cycle for emulation purposes.
The COP remains enabled after execution of the WAIT instruction and
all associated operations apply. If the STOP instruction is disabled,
execution of STOP instruction causes the CPU to execute a NOP
instruction. In addition, the COP is prohibited from being held in RESET.
This prevents a device lock-up condition.
This COP’s objective is to make it impossible for this device to become
stuck or locked-up and to be sure the COP is able to rescue the part from
any situation where it might entrap itself in abnormal or unintended
behavior. This function is a mask option.
10.6 Timer During Wait Mode
The CPU clock halts during wait mode, but the timer remains active. If
interrupts are enabled, a timer interrupt will cause the processor to exit
wait mode. The COP is always enabled while in user mode.
10.7 Core Timer Power Supply Source
The core timer is supplied by VDD and VSS. VDD2 and VSS2 are not
needed here because this module is not susceptible to supply noise.
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