参数资料
型号: TS80C52X2-VIBB
厂商: TEMIC SEMICONDUCTORS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PQFP44
封装: PLASTIC, LCC-44
文件页数: 24/56页
文件大小: 689K
代理商: TS80C52X2-VIBB
Rev. C - Aug. 31, 1999
30
TS80C52X2
6.8 ONCETM 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:
q
Pull ALE low while the device is in reset (RST high) and PSEN is high.
q
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
Float
Weak pull-up
Active
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