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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
鎻忚堪锛� IC 8051 MCU FLASH 64K 44VQFP
妯欐簴鍖呰锛� 160
绯诲垪锛� 89C
鏍稿績铏曠悊鍣細 8051
鑺珨灏哄锛� 8-浣�
閫熷害锛� 60MHz
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澶栧湇瑷倷锛� POR锛孭WM锛學DT
杓稿叆/杓稿嚭鏁�(sh霉)锛� 34
绋嬪簭瀛樺劜鍣ㄥ閲忥細 64KB锛�64K x 8锛�
绋嬪簭瀛樺劜鍣ㄩ鍨嬶細 闁冨瓨
EEPROM 澶�?銆�?/td> 2K x 8
RAM 瀹归噺锛� 2K x 8
闆诲 - 闆绘簮 (Vcc/Vdd)锛� 2.7 V ~ 5.5 V
鎸暕鍣ㄥ瀷锛� 澶栭儴
宸ヤ綔婧害锛� -40°C ~ 85°C
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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