ONCE(TM) Mode (ON Chip Emulation) The ONCE mode " />
參數(shù)資料
型號: AT89C51IC2-SLSUL
廠商: Atmel
文件頁數(shù): 8/140頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 32K 44PLCC
產(chǎn)品培訓模塊: MCU Product Line Introduction
標準包裝: 972
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 32KB(32K 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 ~ 3.6 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
105
AT89C51IC2
4301D–8051–02/08
ONCE(TM) Mode (ON
Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using AT89C51IC2 with-
out removing the circuit from the board. The ONCE mode is invoked by driving certain
pins of the AT89C51IC2; the following sequence must be exercised:
Pull ALE low while the device is in reset (RST high) and PSEN is high.
Hold ALE low as RST is deactivated.
While the AT89C51IC2 is in ONCE mode, an emulator or test CPU can be used to drive
the circuit Table 82 shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 82. External Pin Status during ONCE Mode
(a) "Once" is a registered trademark of Intel Corporation.
ALE
PSEN
Port 0
Port 1
Port 2
Port 3
Port I2
XTALA1/2
XTALB1/2
Weak
pull-up
Weak
pull-up
Float
Weak
pull-up
Weak
pull-up
Weak
pull-up
Float
Active
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