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參數(shù)資料
| 型號(hào)： | TS87C52X2-LIER |
| 英文描述： | 8-bit CMOS Microcontroller 0-60 MHz |
| 中文描述： | 8位CMOS微控制器0-60兆赫 |
| 文件頁(yè)數(shù)： | 30/54頁(yè) |
| 文件大小： | 626K |
| 代理商： | TS87C52X2-LIER |
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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
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| TS87C52X2-LIJB | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:8-bit CMOS Microcontroller 0-60 MHz |
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| TS87C52X2-LIKD | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:8-bit CMOS Microcontroller 0-60 MHz |
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