參數(shù)資料
型號: HMS99C58S
廠商: Electronic Theatre Controls, Inc.
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH
中文描述: 8位單片機與嵌入式閃存微控制器
文件頁數(shù): 73/73頁
文件大小: 696K
代理商: HMS99C58S
HMS99C51S/52S/54S/56S/58S
Sep. 2004 Ver 1.01
69
Hardware Conditions to Enter the ISP Mode
The In-System Programming (ISP) is performed without removing the microcontroller from the system. The In-
System Programming(ISP) facility consists of a series of internal hardware resources coupled with internal firm-
ware through the serial port. The In-System Programming (ISP) facility make in-circuit programming in an em-
bedded application possible with a minimum of additional expense in components and circuit board area.
The bootloader can be executed by holding PSEN LOW, EA/V
PP
greater than V
IH
(such as +5V), and ALE/
PROG HIGH at the falling edge of RESET. The ISP function block uses four pins: TxD, RxD, V
SS
, and V
CC
.
Only a small connector needs to be available to interface your application to an external circuit in order to use
this feature.
EA / V
PP
ALE / PROG
PSEN
V
CC
RESET
RxD / P3.0
TxD / P3.1
XTAL2
XTAL1
V
SS
V
CC
(+5V)
V
CC
(+5V) : 1
V
CC
(+5V) : 1
V
SS
(0V) : 0
ISP Configuration
HMS99C58S
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