參數(shù)資料
型號: AT89C4051-24SU
廠商: Atmel
文件頁數(shù): 15/19頁
文件大?。?/td> 0K
描述: IC MCU 4K FLASH 24MHZ 20-SOIC
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 37
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 24MHz
連通性: UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,LED,POR
輸入/輸出數(shù): 15
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: 閃存
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 6 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
包裝: 管件
產(chǎn)品目錄頁面: 616 (CN2011-ZH PDF)
5
1001F–MICRO–6/08
AT89C4051
6.
Special Function Registers
A map of the on-chip memory area called the Special Function Register (SFR) space is shown in
Note that not all of the addresses are occupied, and unoccupied addresses may not be imple-
mented on the chip. Read accesses to these addresses will in general return random data, and
write accesses will have an indeterminate effect.
User software should not write 1s to these unlisted locations, since they may be used in future
products to invoke new features. In that case, the reset or inactive values of the new bits will
always be 0.
Table 6-1.
AT89C4051 SFR Map and Reset Values
0F8H
0FFH
0F0H
B
00000000
0F7H
0E8H
0EFH
0E0H
ACC
00000000
0E7H
0D8H
0DFH
0D0H
PSW
00000000
0D7H
0C8H
0CFH
0C0H
0C7H
0B8H
IP
XXX00000
0BFH
0B0H
P3
11111111
0B7H
0A8H
IE
0XX00000
0AFH
0A0H
0A7H
98H
SCON
00000000
SBUF
XXXXXXXX
9FH
90H
P1
11111111
97H
88H
TCON
00000000
TMOD
00000000
TL0
00000000
TL1
00000000
TH0
00000000
TH1
00000000
8FH
80H
SP
00000111
DPL
00000000
DPH
00000000
PCON
0XXX0000
87H
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