參數(shù)資料
型號(hào): AT89C5131A-PUTIM
廠商: Atmel
文件頁數(shù): 62/176頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 32K USB 32QFN
標(biāo)準(zhǔn)包裝: 260
系列: AT89C513x
核心處理器: C52X2
芯體尺寸: 8-位
速度: 48MHz
連通性: I²C,SPI,UART/USART,USB
外圍設(shè)備: LED,POR,PWM,WDT
輸入/輸出數(shù): 18
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 4K x 8
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 32-VQFN 裸露焊盤
包裝: 托盤
配用: AT89STK-10-ND - KIT EVAL APPL MASS STORAGE
AT89STK-05-ND - KIT STARTER FOR AT89C5131
152
AT89C5131
4136C–USB–04/05
Reduced EMI Mode
The ALE signal is used to demultiplex address and data buses on port 0 when used with
external program or data memory. Nevertheless, during internal code execution, ALE
signal is still generated. In order to reduce EMI, ALE signal can be disabled by setting
AO bit.
The AO bit is located in AUXR register at bit location 0. As soon as AO is set, ALE is no
longer output but remains active during MOVX and MOVC instructions and external
fetches. During ALE disabling, ALE pin is weakly pulled high.
Table 110. AUXR Register
AUXR - Auxiliary Register (8Eh)
Reset Value = 0X0X 1100b
Not bit addressable
7654
3210
DPU
-
M0
-
XRS1
XRS0
EXTRAM
AO
Bit
Number
Bit
Mnemonic
Description
7DPU
Disable Weak Pull Up
Cleared to enabled weak pull up on standard Ports
Set to disable weak pull up on standard Ports
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
ERAM Size
XRS1
XRS0
ERAM size
0
256 bytes
0
1
512 bytes
1
0
768 bytes
1
1024 bytes (default)
2XRS0
1
EXTRAM
EXTRAM bit
Cleared to access internal ERAM using MOVX at Ri at DPTR.
Set to access external memory.
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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