参数资料
型号: MC68HC05J1AVDW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封装: SOIC-20
文件页数: 75/128页
文件大小: 1279K
代理商: MC68HC05J1AVDW
Technical Data
MC68HC05J1A — Rev. 3.0
50
Resets
MOTOROLA
Resets
5.3 Reset Types
A reset immediately stops the operation of the instruction being
executed, initializes certain control bits, and loads the program counter
with a user-defined reset vector address. These conditions produce a
reset:
Initial power-up (power-on reset)
A logic 0 applied to the RESET pin (external reset)
Timeout of the mask-optional computer operating properly (COP)
watchdog (COP reset)
An opcode fetch from an address not in the memory map (illegal
address reset)
Figure 5-1 is a block diagram of the reset sources.
Figure 5-1. Reset Sources
5.3.1 Power-On Reset
A positive transition on the VDD pin generates a power-on reset. The
power-on reset is strictly for power-up conditions and cannot be used to
detect drops in power supply voltage.
VDD
RESET
LATCH
INTERNAL ADDRESS BUS
R
COP WATCHDOG
(MASK OPTION)
POWER-ON RESET
ILLEGAL ADDRESS RESET
RST
TO CPU
INTERNAL CLOCK
AND
SUBSYSTEMS
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