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鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� AT89C51ID2-RLRUM
寤犲晢锛� Atmel
鏂囦欢闋�(y猫)鏁�(sh霉)锛� 12/157闋�(y猫)
鏂囦欢澶�?銆�?/td> 0K
鎻忚堪锛� IC 8051 MCU 64K FLASH 44-VQFP
鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� MCU Product Line Introduction
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 1,500
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
閫i€氭€э細 I²C锛孲PI锛孶ART/USART
澶栧湇瑷�(sh猫)鍌欙細 POR锛孭WM锛學DT
杓稿叆/杓稿嚭鏁�(sh霉)锛� 34
绋嬪簭瀛樺劜(ch菙)鍣ㄥ閲忥細 64KB锛�64K x 8锛�
绋嬪簭瀛樺劜(ch菙)鍣ㄩ(l猫i)鍨嬶細 闁冨瓨
EEPROM 澶у皬锛� 2K x 8
RAM 瀹归噺锛� 2K x 8
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鎸暕鍣ㄥ瀷锛� 澶栭儴
宸ヤ綔婧害锛� -40°C ~ 85°C
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鍖呰锛� 妯�(bi膩o)婧�(zh菙n)鍖呰
閰嶇敤锛� AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
鍏跺畠鍚嶇ū(ch膿ng)锛� AT89C51ID2-RLRUMDKR
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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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