參數(shù)資料
型號: 68HC05PL4
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數(shù): 33/98頁
文件大小: 1019K
代理商: 68HC05PL4
April 30, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05PL4
REV 2.0
RESETS
MOTOROLA
5-1
SECTION 5
RESETS
This section describes the four reset sources and how they initialize the 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 vec-
tor address. The following conditions produce a reset:
Initial power-up of device (power-on reset)
A logic zero applied to the RESET pin (external reset)
Time-out of the COP watchdog (COP reset)
Fetch of an opcode from an address not in the memory map
(illegal address reset)
Figure 5-1. Reset Sources
5.1
POWER-ON RESET
A positive transition on the V
DD
pin generates a power on reset. The power-on
reset is strictly for conditions during powering up and cannot be used to detect
drops in power supply voltage.
RESET
RESET
LATCH
R
C
COP WATCHDOG
POWER-ON RESET
ILLEGAL ADDRESS RESET
INTERNAL
ADDRESS BUS
D
INTERNAL
CLOCK
S
RST
TO CPU
AND
SUBSYSTEMS
V
DD
4-CYCLE
COUNTER
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