參數(shù)資料
型號: AT89C51RB2-SLSUM
廠商: Atmel
文件頁數(shù): 46/127頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 16K 44PLCC
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 972
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
25
AT89C51RB2/RC2
4180E–8051–10/06
Registers
Table 19. AUXR Register
AUXR - Auxiliary Register (8Eh)
Reset Value = XX0X 00’HSB. XRAM’0b (see Table 65)
Not bit addressable
76
54
32
1
0
DPU
-
M0
-
XRS1
XRS0
EXTRAM
AO
Bit
Number
Bit
Mnemonic
Description
7DPU
Disable Weak Pull-up
Cleared to activate the permanent weak pull up when latch data is logical 1
Set to disactive the weak pull-up (reduce power consumption)
6-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5M0
Pulse Length
Cleared to stretch MOVX control: the RD and the WR pulse length is 6 clock
periods (default).
Set to stretch MOVX control: the RD and the WR pulse length is 30 clock
periods.
4-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3XRS1
XRAM Size
XRS1
XRS0 XRAM size
0
256 Bytes (default)
0
1
512 Bytes
1
0
768 Bytes
1
1024 Bytes
2XRS0
1
EXTRAM
EXTRAM Bit
Cleared to access internal XRAM using movx @ Ri/ @ DPTR.
Set to access external memory.
Programmed by hardware after Power-up regarding Hardware Security Byte
(HSB), default setting, XRAM selected.
0AO
ALE Output Bit
Cleared, ALE is emitted at a constant rate of 1/6 the oscillator frequency (or 1/3 if
X2 mode is used). (default) Set, ALE is active only during a MOVX or MOVC
instruction is used.
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