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AT89C5130A-RDTIM Datasheet(PDF) 158 Page - ATMEL Corporation |
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AT89C5130A-RDTIM Datasheet(HTML) 158 Page - ATMEL Corporation |
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158 / 184 page  158 AT89C5130A/31A-M 4337C–USB–02/05 ONCE Mode (ON Chip Emulation) The ONCE mode facilitates testing and debugging of systems using AT89C5130A/31A- M without removing the circuit from the board. The ONCE mode is invoked by driving certain pins of the AT89C5130A/31A-M; 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 AT89C5130A/31A-M is in ONCE mode, an emulator or test CPU can be used to drive the circuit Table 113 shows the status of the port pins during ONCE mode. Normal operation is restored when normal reset is applied. Table 113. External Pin Status during ONCE Mode ALE PSEN Port 0 Port 1 Port 2 Port 3 Port I2 XTAL1/2 Weak pull-up Weak pull-up Float Weak pull-up Weak pull-up Weak pull-up Float Active |
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