參數(shù)資料
型號: MC68HRC705JP7CP
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 103/164頁
文件大?。?/td> 1165K
代理商: MC68HRC705JP7CP
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
43
Chapter 5
Resets
5.1 Introduction
This section describes the five reset sources and how they initialize the microcontroller unit (MCU). 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 of device (power-on reset)
A logic 0 applied to the RESET pin (external reset)
Timeout of the computer operating properly (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 Sources
RESET
LATCH
R
COPEN
COP WATCHDOG
POWER-ON RESET
ILLEGAL ADDRESS RESET
INTERNAL
D
INTERNAL
CLOCK
S
RST
TO CPU
AND
LVREN
LOW-VOLTAGE RESET
VDD
3-CYCLE
CLOCKED
1-SHOT
SUBSYSTEMS
ADDRESS BUS
MASK OPTION REGISTER ($1FF1)
INTERNAL DATA BUS
相關PDF資料
PDF描述
MC68HC705SP7CP 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
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