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AT89C51ID2-RDTIM Datasheet(PDF) 110 Page - ATMEL Corporation |
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AT89C51ID2-RDTIM Datasheet(HTML) 110 Page - ATMEL Corporation |
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110 / 159 page  110 AT89C51ID2 4289A–8051–09/03 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 83 shows the status of the port pins during ONCE mode. Normal operation is restored when normal reset is applied. Table 83. 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 Active |
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