AT89C51IC2 Atmel Corporation, AT89C51IC2 Datasheet - Page 105

• Manufacturer Part Number: AT89C51IC2
• Manufacturer: Atmel Corporation

Specifications of AT89C51IC2

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

ONCE
Chip Emulation)
4301D–8051–02/08
(TM)
Mode (ON
The ONCE mode facilitates testing and debugging of systems using AT89C51IC2 with-
out removing the circuit from the board. The ONCE mode is invoked by driving certain
pins of the AT89C51IC2; the following sequence must be exercised:
•
•
While the AT89C51IC2 is in ONCE mode, an emulator or test CPU can be used to drive
the circuit Table 82 shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 82. External Pin Status during ONCE Mode
(a) "Once" is a registered trademark of Intel Corporation.
pull-up
Weak
ALE
Pull ALE low while the device is in reset (RST high) and PSEN is high.
Hold ALE low as RST is deactivated.
PSEN
pull-up
Weak
Port 0
Float
Port 1
pull-up
Weak
Port 2
pull-up
Weak
Port 3
pull-up
Weak
Port I2
Float
XTALA1/2
Active
XTALB1/2
Active
105