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AT89C51ED2-RDTIM bảng dữ liệu(PDF) 88 Page - ATMEL Corporation

tên linh kiện AT89C51ED2-RDTIM
Giải thích chi tiết về linh kiện  8-bit Flash Microcontroller
PDF  137 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM bảng dữ liệu(HTML) 88 Page - ATMEL Corporation

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AT89C51RD2/ED2
4235E–8051–04/04
ONCE® Mode (ON-
Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using AT89C51RD2/ED2
without removing the circuit from the board. The ONCE mode is invoked by driving cer-
tain pins of the AT89C51RD2/ED2; 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 AT89C51RD2/ED2 is in ONCE mode, an emulator or test CPU can be used to
drive the circuit. Table 63 shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 63. External Pin Status During ONCE Mode
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
Active



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