AT89C5131-TISIL Atmel, AT89C5131-TISIL Datasheet - Page 151

• Manufacturer Part Number: AT89C5131-TISIL
• Description: IC 8051 MCU FLASH 32K USB 28SOIC
• Manufacturer: Atmel
• Series: AT89C513xr

Specifications of AT89C5131-TISIL

• Core Processor: C52X2
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: LED, POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• For Use With: AT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-05 - KIT STARTER FOR AT89C5131
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

ONCE Mode (ON
Chip Emulation)
4136B–USB–09/03
The ONCE mode facilitates testing and debugging of systems using AT89C5131 without
removing the circuit from the board. The ONCE mode is invoked by driving certain pins
of the AT89C5131; the following sequence must be exercised:
•
•
While the AT89C5131 is in ONCE mode, an emulator or test CPU can be used to drive
the circuit Table 109 shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 109. External Pin Status during ONCE Mode
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
AT89C5131
XTALA1/2
Active
XTALB1/2
Active
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