13. ONCETM Mode (ON Chip Emulation) The ONCE " />
參數(shù)資料
型號(hào): AT87C58X2-SLSUL
廠商: Atmel
文件頁數(shù): 27/62頁
文件大?。?/td> 0K
描述: IC 8051 MCU 32K EPROM 44PLCC
標(biāo)準(zhǔn)包裝: 972
系列: 87C
核心處理器: 8051
芯體尺寸: 8-位
速度: 30/20MHz
連通性: UART/USART
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 32
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: OTP
RAM 容量: 256 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: 44-LCC(J 形引線)
包裝: 管件
33
4431E–8051–04/06
AT/TS8xC54/8X2
13. ONCETM Mode (ON Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using TS80C54/58X2 without
removing the circuit from the board. The ONCE mode is invoked by driving certain pins of the
TS80C54/58X2; 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 TS80C54/58X2 is in ONCE mode, an emulator or test CPU can be used to drive the
circuit Table 13-1 shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 13-1.
External Pin Status during ONCE Mode
ALE
PSEN
Port 0
Port 1
Port 2
Port 3
XTAL1/2
Weak pull-up
Float
Weak pull-up
Active
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