参数资料
型号: MC68HC705J5ACDWR3
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封装: SOIC-20
文件页数: 36/106页
文件大小: 1069K
代理商: MC68HC705J5ACDWR3
July 16, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05J5A
RESETS
MOTOROLA
REV 2.1
5-1
SECTION 5
RESETS
The MCU can be reset from ve sources: one external input and four internal
restart conditions.
Initial power up of device (power on reset)
A logic zero applied to the RESET pin (external reset)
Timeout of the COP watchdog (COP reset)
Low voltage applied to the device (LVR reset)
Fetch of an opcode from an address not in the memory map (illegal
address reset)
Figure 5-1 shows a block diagram of the reset sources and their interaction.
Figure 5-1. Reset Block Diagram
Illegal Address
(ILADR)
CPU
LATCH
RESET
COP Watchdog
(COPR)
RST
OSC
Data
Address
PH2
To other
peripherals
S
IRQ
Mode
Select
To Interrupt
logic
LATCH
R
Power-On Reset
(POR)
VDD
Low Voltage Reset
(LVR)
VDD
R
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