AT83C5134 Atmel Corporation, AT83C5134 Datasheet - Page 27

• Manufacturer Part Number: AT83C5134
• Manufacturer: Atmel Corporation

Specifications of AT83C5134

• 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): 8
• Watchdog: Yes

9. AT89C5131 ROM
9.1
9.1.1
9.2
7683C–USB–11/07
ROM Structure
ROM Lock System
Hardware Configuration Byte
The AT89C5131 ROM memory is divided in two different arrays:
The configuration byte sets the starting microcontroller options and the security levels.
The starting default options are X1 mode, Oscillator A.
Table 9-1.
HSB = xxxx xx11b
The program Lock system, when programmed, protects the on-chip program against software
piracy.
• the code array: 16-32 Kbytes.
• the configuration byte:1 byte.
Number
5-4
1-0
Bit
7
6
3
2
7
-
OSCON1-0
Mnemonic
Hardware Security Byte (HSB)
HSB (S:EFh)
Power configuration Register
LB1-0
6
-
Bit
-
-
-
-
OSCON1
Description
Reserved
Reserved
Oscillator Control Bits
These two bits are used to control the oscillator in order to reduce consumption.
OSCON1 OSCON0 Description
1
1
0
0
Reserved
Reserved
User Program Lock Bits
See
5
1 The oscillator is configured to run from 0 to 32 MHz
0 The oscillator is configured to run from 0 to 16 MHz
1 The oscillator is configured to run from 0 to 8 MHz
0 This configuration shouldn’t be set
Table 9-2 on page 28
OSCON0
4
3
-
AT83C5134/35/36
2
-
LB1
1
LB0
0
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