AT83C5136 Atmel Corporation, AT83C5136 Datasheet - Page 133
AT83C5136
Manufacturer Part Number
AT83C5136
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT83C5134.pdf
(166 pages)
Specifications of AT83C5136
Max. Operating Frequency
32 MHz
Cpu
8051-12C
Max I/o Pins
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Twi (i2c)
1
Uart
1
Sram (kbytes)
1.25
Eeprom (bytes)
512
Operating Voltage (vcc)
2.7 to 3.6
Timers
4
Mask Rom (kbytes)
32
Watchdog
Yes
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23. Power Monitor
23.1
7683C–USB–11/07
Description
The POR/PFD function monitors the internal power-supply of the CPU core memories and the
peripherals, and if needed, suspends their activity when the internal power supply falls below a
safety threshold. This is achieved by applying an internal reset to them.
By generating the Reset the Power Monitor insures a correct start up when AT89C5131 is pow-
ered up.
In order to startup and maintain the microcontroller in correct operating mode, V
bilized in the V
compatible with logic level VIH/VIL.
These parameters are controlled during the three phases: power-up, normal operation and
power going down. See Figure 23-1.
Figure 23-1. Power Monitor Block Diagram
Note:
The Voltage regulator generates a regulated internal supply for the CPU core the memories and
the peripherals. Spikes on the external Vcc are smoothed by the voltage regulator.
The Power fail detect monitor the supply generated by the voltage regulator and generate a
reset if this supply falls below a safety threshold as illustrated in the Figure 23-2 below.
RST pin
1. Once XTAL1 High and low levels reach above and below VIH/VIL. a 1024 clock period delay
XTAL1
will extend the reset coming from the Power Fail Detect. If the power falls below the Power Fail
Detect threshold level, the Reset will be applied immediately.
CC
PCA
Watchdog
operating range and the oscillator has to be stabilized with a nominal amplitude
Voltage Regulator
Power Fail Detect
Power On Reset
(1)
Hardware
Watchdog
VCC
Regulated
Supply
Internal Reset
Peripherals
CPU core
Memories
AT83C5134/35/36
CC
has to be sta-
133
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