參數(shù)資料
型號(hào): 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(jī)與嵌入式閃存微控制器
文件頁數(shù): 58/73頁
文件大?。?/td> 696K
代理商: HMS99C58S
HMS99C51S/52S/54S/56S/58S
54
Sep. 2004 Ver 1.01
Bootloader Process
The bootloader can be activated by Hardware conditions. The Hardware conditions (PSEN = 0, EA = 1, ALE =
1) during the Reset falling edge force the on-chip bootloader execution. This allows an application to be built
that will normally execute the end user’s code but can be manually forced into default ISP operation. As PSEN
is a an output port in normal operating mode (running user application or bootloader code) after reset, it is rec-
ommended to release PSEN after falling edge of reset signal. The hardware conditions are sampled at reset sig-
nal falling edge, thus they can be released at any time when reset input is low. The on-chip bootloader boot
process is shown in Figure 16.
Figure 16. Bootloader Process by hardware
Hardware
Condition=
BLJB
≠0
Ι
f BLJB = 0 then
ENBOOT & INTROM_EN bit(FCON)
is set
RESET
Yes
No
No
BLJB=0
ENBOOT=1
INTROM_EN=1
Yes
MagnaChip Bootloader
PC = F800
H
User Application
PC = 0000
H
BLJB=1
ENBOOT=0
INTROM_EN=0
(PSEN=0, EA=1 and ALE=1)
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