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鍙冩暩(sh霉)璩囨枡
鍨嬭櫉锛� AT89C51ID2-RLTIM
寤犲晢锛� Atmel
鏂囦欢闋佹暩(sh霉)锛� 12/157闋�
鏂囦欢澶�?銆�?/td> 0K
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鏍稿績铏曠悊鍣細 8051
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RAM 瀹归噺锛� 2K x 8
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灏佽/澶栨锛� 44-LQFP
鍖呰锛� 鎵樼洡
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109
AT89C51ID2
4289C鈥�8051鈥�11/05
ONCE(TM) Mode (ON
Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using AT89C51ID2 with-
out removing the circuit from the board. The ONCE mode is invoked by driving certain
pins of the AT89C51ID2; 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 AT89C51ID2 is in ONCE mode, an emulator or test CPU can be used to drive
the circuit Table 84 shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 84. External Pin Status during ONCE Mode
(a) "Once" is a registered trademark of Intel Corporation.
ALE
PSEN
Port 0
Port 1
Port 2
Port 3
Port I2
XTALA1/2
XTALB1/2
Weak
pull-up
Weak
pull-up
Float
Weak
pull-up
Weak
pull-up
Weak
pull-up
Float
Active
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