AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 74

• Manufacturer Part Number: AT89C5131A-L
• Manufacturer: Atmel Corporation

Specifications of AT89C5131A-L

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 48 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): 1024
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 3.6
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

74
AT89C5131A-L
Table 58. PCON Register
PCON - Power Control Register (87h)
Reset Value = 00X1 0000b
Not bit addressable
Power-off flag reset value will be 1 only after a power on (cold reset). A warm reset
doesn’t affect the value of this bit.
Number
SMOD1
Bit
7
6
5
4
3
2
1
0
7
Mnemonic
SMOD1
SMOD0
SMOD0
POF
GF1
GF0
Bit
IDL
PD
-
6
Description
Serial port Mode bit 1 for UART
Set to select double baud rate in mode 1, 2 or 3.
Serial port Mode bit 0 for UART
Cleared to select SM0 bit in SCON register.
Set to select FE bit in SCON register.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Power-Off Flag
Cleared to recognize next reset type.
Set by hardware when V
software.
General-purpose Flag
Cleared by user for general-purpose usage.
Set by user for general-purpose usage.
General-purpose Flag
Cleared by user for general-purpose usage.
Set by user for general-purpose usage.
Power-down Mode Bit
Cleared by hardware when reset occurs.
Set to enter power-down mode.
Idle Mode Bit
Cleared by hardware when interrupt or reset occurs.
Set to enter idle mode.
5
-
POF
4
CC
rises from 0 to its nominal voltage. Can also be set by
GF1
3
GF0
2
PD
1
4338F–USB–08/07
IDL
0