參數(shù)資料
型號(hào): TS87C52X2-VIKD
英文描述: CONN HEADER 13POS .100 STR TIN
中文描述: 8位CMOS微控制器0-60兆赫
文件頁數(shù): 30/54頁
文件大?。?/td> 626K
代理商: TS87C52X2-VIKD
30
Rev. B - Jan. 25, 1999
Preliminary
TS80C52X2
6.8 ONCE Mode (ON Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using TS80C52X2 without removing the circuit from
the board. The ONCE mode is invoked by driving certain pins of the TS80C52X2; 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 TS80C52X2 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 15. 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
TS87C52X2-VIKR 8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-VIEB 8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-VIED 8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-VIAB 8-bit CMOS Microcontroller 0-60 MHz
TS87C52X2-VIAD 8-bit CMOS Microcontroller 0-60 MHz
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