02H 00H 00H ; 是 LJMP 0000H
建议查下下面的二进制码
我用的是STC89C51，还没有STC8H，希望客服赏我一片{:4_165:} 神农鼎 发表于 2023-8-16 07:32
02H 00H 00H ; 是 LJMP 0000H
建议查下下面的二进制码
我用的是STC89C51，还没有STC8H，希望客服赏我一片{:4_165:} 神农鼎 发表于 2023-8-16 07:35
STC32G12K128, STC32G8K64的相关复位标志位和控制位
还没有STC32，希望客服赏我一片{:4_165:} gentleman 发表于 2023-8-16 09:38
牛啊，不过没有启动引导代码，单片机为什么也能正常工作啊
不清楚哎，51单片机不需要，但高级单片机需要。希望能有套教程，详细讲解一下单片机内部CPU的原理，偏理论型的那种{:4_164:} DebugLab 发表于 2023-8-16 00:57
扇区擦除后一定是FF
根据MCS-51指令集
FF指令是
{:4_202:}涨知识 gentleman 发表于 2023-8-16 09:38
牛啊，不过没有启动引导代码，单片机为什么也能正常工作啊
启动引导代码初始化内存的，这里不初始化内存也不耽误点灯
DebugLab 发表于 2023-8-17 22:16
启动引导代码初始化内存的，这里不初始化内存也不耽误点灯
STARTUP.A51
$NOMOD51
;------------------------------------------------------------------------------
;This file is part of the C51 Compiler package
;Copyright (c) 1988-2005 Keil Elektronik GmbH and Keil Software, Inc.
;Version 8.01
;
;*** <<< Use Configuration Wizard in Context Menu >>> ***
;------------------------------------------------------------------------------
;STARTUP.A51:This code is executed after processor reset.
;
;To translate this file use A51 with the following invocation:
;
; A51 STARTUP.A51
;
;To link the modified STARTUP.OBJ file to your application use the following
;Lx51 invocation:
;
; Lx51 your object file list, STARTUP.OBJcontrols
;
;------------------------------------------------------------------------------
;
;User-defined <h> Power-On Initialization of Memory
;
;With the following EQU statements the initialization of memory
;at processor reset can be defined:
;
; <o> IDATALEN: IDATA memory size <0x0-0x100>
; <i> Note: The absolute start-address of IDATA memory is always 0
; <i> The IDATA space overlaps physically the DATA and BIT areas.
IDATALEN EQU 80H
;
; <o> XDATASTART: XDATA memory start address <0x0-0xFFFF>
; <i> The absolute start address of XDATA memory
XDATASTART EQU 0
;
; <o> XDATALEN: XDATA memory size <0x0-0xFFFF>
; <i> The length of XDATA memory in bytes.
XDATALEN EQU 0
;
; <o> PDATASTART: PDATA memory start address <0x0-0xFFFF>
; <i> The absolute start address of PDATA memory
PDATASTART EQU 0H
;
; <o> PDATALEN: PDATA memory size <0x0-0xFF>
; <i> The length of PDATA memory in bytes.
PDATALEN EQU 0H
;
;</h>
;------------------------------------------------------------------------------
;
;<h> Reentrant Stack Initialization
;
;The following EQU statements define the stack pointer for reentrant
;functions and initialized it:
;
; <h> Stack Space for reentrant functions in the SMALL model.
;<q> IBPSTACK: Enable SMALL model reentrant stack
; <i> Stack space for reentrant functions in the SMALL model.
IBPSTACK EQU 0 ; set to 1 if small reentrant is used.
;<o> IBPSTACKTOP: End address of SMALL model stack <0x0-0xFF>
; <i> Set the top of the stack to the highest location.
IBPSTACKTOP EQU 0xFF +1 ; default 0FFH+1
; </h>
;
; <h> Stack Space for reentrant functions in the LARGE model.
;<q> XBPSTACK: Enable LARGE model reentrant stack
; <i> Stack space for reentrant functions in the LARGE model.
XBPSTACK EQU 0 ; set to 1 if large reentrant is used.
;<o> XBPSTACKTOP: End address of LARGE model stack <0x0-0xFFFF>
; <i> Set the top of the stack to the highest location.
XBPSTACKTOP EQU 0xFFFF +1 ; default 0FFFFH+1
; </h>
;
; <h> Stack Space for reentrant functions in the COMPACT model.
;<q> PBPSTACK: Enable COMPACT model reentrant stack
; <i> Stack space for reentrant functions in the COMPACT model.
PBPSTACK EQU 0 ; set to 1 if compact reentrant is used.
;
; <o> PBPSTACKTOP: End address of COMPACT model stack <0x0-0xFFFF>
; <i> Set the top of the stack to the highest location.
PBPSTACKTOP EQU 0xFF +1 ; default 0FFH+1
; </h>
;</h>
;------------------------------------------------------------------------------
;
;Memory Page for Using the Compact Model with 64 KByte xdata RAM
;<e>Compact Model Page Definition
;
;<i>Define the XDATA page used for PDATA variables.
;<i>PPAGE must conform with the PPAGE set in the linker invocation.
;
; Enable pdata memory page initalization
PPAGEENABLE EQU 0 ; set to 1 if pdata object are used.
;
; <o> PPAGE number <0x0-0xFF>
; <i> uppermost 256-byte address of the page used for PDATA variables.
PPAGE EQU 0
;
; <o> SFR address which supplies uppermost address byte <0x0-0xFF>
; <i> most 8051 variants use P2 as uppermost address byte
PPAGE_SFR DATA 0A0H
;
; </e>
;------------------------------------------------------------------------------
; Standard SFR Symbols
ACC DATA 0E0H
B DATA 0F0H
SP DATA 81H
DPL DATA 82H
DPH DATA 83H
NAME ?C_STARTUP
?C_C51STARTUP SEGMENT CODE
?STACK SEGMENT IDATA
RSEG ?STACK
DS 1
EXTRN CODE (?C_START)
PUBLIC?C_STARTUP
CSEG AT 0
?C_STARTUP: LJMP STARTUP1
RSEG ?C_C51STARTUP
STARTUP1:
IF IDATALEN <> 0
MOV R0,#IDATALEN - 1
CLR A
IDATALOOP: MOV @R0,A
DJNZ R0,IDATALOOP
ENDIF
IF XDATALEN <> 0
MOV DPTR,#XDATASTART
MOV R7,#LOW (XDATALEN)
IF (LOW (XDATALEN)) <> 0
MOV R6,#(HIGH (XDATALEN)) +1
ELSE
MOV R6,#HIGH (XDATALEN)
ENDIF
CLR A
XDATALOOP: MOVX @DPTR,A
INC DPTR
DJNZ R7,XDATALOOP
DJNZ R6,XDATALOOP
ENDIF
IF PPAGEENABLE <> 0
MOV PPAGE_SFR,#PPAGE
ENDIF
IF PDATALEN <> 0
MOV R0,#LOW (PDATASTART)
MOV R7,#LOW (PDATALEN)
CLR A
PDATALOOP: MOVX @R0,A
INC R0
DJNZ R7,PDATALOOP
ENDIF
IF IBPSTACK <> 0
EXTRN DATA (?C_IBP)
MOV ?C_IBP,#LOW IBPSTACKTOP
ENDIF
IF XBPSTACK <> 0
EXTRN DATA (?C_XBP)
MOV ?C_XBP,#HIGH XBPSTACKTOP
MOV ?C_XBP+1,#LOW XBPSTACKTOP
ENDIF
IF PBPSTACK <> 0
EXTRN DATA (?C_PBP)
MOV ?C_PBP,#LOW PBPSTACKTOP
ENDIF
MOV SP,#?STACK-1
; This code is required if you use L51_BANK.A51 with Banking Mode 4
;<h> Code Banking
; <q> Select Bank 0 for L51_BANK.A51 Mode 4
#if 0
; <i> Initialize bank mechanism to code bank 0 when using L51_BANK.A51 with Banking Mode 4.
EXTRN CODE (?B_SWITCH0)
CALL ?B_SWITCH0 ; init bank mechanism to code bank 0
#endif
;</h>
LJMP ?C_START
END
找到了启动引导文件的汇编， 好像只跟内存和堆栈有关， 的确和IO 没关。
我还以为那些特殊功能寄存器，外设啥的都必须经过启动引导呢。
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