AT89C5131A-TIRUL Atmel, AT89C5131A-TIRUL Datasheet - Page 148

• Manufacturer Part Number: AT89C5131A-TIRUL
• Description: MCU 8051 32K FLASH USB 28-SOIC
• Manufacturer: Atmel
• Series: AT89C513xr

Specifications of AT89C5131A-TIRUL

• 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)
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89STK-05
• For Use With: AT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-05 - KIT STARTER FOR AT89C5131
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -

Reset
Introduction
Reset Input
148
AT89C5131A-L
The reset sources are: Power Management, Hardware Watchdog, PCA Watchdog and
Reset input.
Figure 72. Reset schematic
The Reset input can be used to force a reset pulse longer than the internal reset con-
trolled by the Power Monitor. RST input has a pull-up resistor allowing power-on reset
by simply connecting an external capacitor to V
and input characteristics are discussed in the Section “DC Characteristics” of the
AT89C5131A-L datasheet.
Figure 73. Reset Circuitry and Power-On Reset
RST
RST
Watchdog
Watchdog
Hardware
Monitor
Power
PCA
a. RST input circuitry
VCC
To internal reset
SS
as shown in Figure 73. Resistor value
b. Power-on Reset
Internal Reset
VSS
+
4338F–USB–08/07
RST