參數(shù)資料
型號(hào): TS80C31X2-VLER
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-bit CMOS Microcontroller ROMless
中文描述: 8-BIT, 40 MHz, MICROCONTROLLER, PQFP44
封裝: 1.40 MM HEIGHT, VQFP-44
文件頁(yè)數(shù): 24/40頁(yè)
文件大?。?/td> 484K
代理商: TS80C31X2-VLER
24
Rev. A - Mar. 19, 1999
Preliminary
TS80C31X2
6.7 ONCE Mode (ON Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using TS80C31X2 without removing the circuit from
the board. The ONCE mode is invoked by driving certain pins of the TS80C31X2; the following sequence must
be exercised:
G
Pull ALE low while the device is in reset (RST high) and PSEN is high.
G
Hold ALE low as RST is deactivated.
While the TS80C31X2 is in ONCE mode, an emulator or test CPU can be used to drive the circuit Table 26.
shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 12. External Pin Status during ONCE Mode
ALE
PSEN
Port 0
Port 1
Port 2
Port 3
XTAL1/2
Weak pull-up
Weak pull-up
Float
Weak pull-up
Weak pull-up
Weak pull-up
Active
相關(guān)PDF資料
PDF描述
TS80C31X2-ECAB 8-bit CMOS Microcontroller ROMless
TS80C31X2-ECAD 8-bit CMOS Microcontroller ROMless
TS80C31X2 8-bit CMOS Microcontroller ROMless
TS80C31X2-VCAR 8-bit CMOS Microcontroller ROMless
TS80C31X2-VCAD 8-bit CMOS Microcontroller ROMless
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