AT89C5131A-PUTUM Atmel, AT89C5131A-PUTUM Datasheet - Page 151

• Manufacturer Part Number: AT89C5131A-PUTUM
• Description: IC 8051 MCU FLASH 32K USB 32QFN
• Manufacturer: Atmel
• Series: AT89C513xr

Specifications of AT89C5131A-PUTUM

• 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): 2.7 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Core: 8051
• Processor Series: AT89x
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 48 MHz
• Data Ram Size: 1.25 KB
• Number Of Programmable I/os: 34
• Number Of Timers: 16 bit
• Operating Supply Voltage: 2.7 V to 5.5 V
• Mounting Style: SMD/SMT
• Height: 0.95 mm
• Interface Type: 2-Wire, EUART, SPI, USB
• Length: 7 mm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 7 mm
• For Use With: AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCUAT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-05 - KIT STARTER FOR AT89C5131
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Lead Free Status / Rohs Status: Details

22. Reset
22.1
22.2
22.3
4337K–USB–04/08
Introduction
Reset Input
Reset Output
The reset sources are: Power Management, Hardware Watchdog, PCA Watchdog and Reset
input.
Figure 22-1. Reset schematic
The Reset input can be used to force a reset pulse longer than the internal reset controlled by
the Power Monitor. RST input has a pull-up resistor allowing power-on reset by simply connect-
ing an external capacitor to V
characteristics are discussed in the Section “DC Characteristics” of the AT89C5130A/31A-M
datasheet.
Figure 22-2. Reset Circuitry and Power-On Reset
As detailed in Section “Hardware Watchdog Timer”, page 158, the WDT generates a 96-clock
period pulse on the RST pin. In order to properly propagate this pulse to the rest of the applica-
tion in case of external capacitor or power-supply supervisor circuit, a 1 kΩ resistor must be
added as shown Figure 22-3.
RST
RST
Watchdog
Watchdog
Hardware
Monitor
Power
PCA
a. RST input circuitry
VCC
S S
as shown in Figure 22-2. Resistor value and input
To internal reset
AT89C5130A/31A-M
b. Power-on Reset
Internal Reset
VSS
+
RST
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