AT83EB5114 Atmel Corporation, AT83EB5114 Datasheet - Page 16

• Manufacturer Part Number: AT83EB5114
• Manufacturer: Atmel Corporation

Specifications of AT83EB5114

• Max. Operating Frequency: 24 MHz
• Cpu: 8051-12C
• Max I/o Pins: 11
• Adc Channels: 6
• Adc Resolution (bits): 10
• Adc Speed (ksps): 50
• Sram (kbytes): 0.25
• Eeprom (bytes): 256
• Operating Voltage (vcc): 3.0 to 3.6
• Timers: 4
• Mask Rom (kbytes): 4
• Watchdog: Yes

Clock Control Register
Oscillator B Frequency Adjust
Register
16
AT89/83EB5114
The clock control register is used to define the clock system behavior.
Table 3. OSCON Register
OSCCON - Clock Control Register (86h)
Reset Value = XXX0
0"RST_OSC1.RST_OSC0""RST_OSC1.RST_OSC0""RST_OSC1.RST_OSC0" b
Not bit addressable
Note:
The OSCB Frequency Adjust register is used to adjust the frequency in case of external
components inaccuracies. It allows a frequency variation about 15% around 12 MHz
with a step of around 1%.
Number
Bit
7
6
5
4
3
2
1
0
7
-
Before changing oscillator selection in CKSEL, be sure that the oscillator you select is
started. OSCA is ready as soon as OSCARY is set by hardware, OSCB and OSCC are
ready after 4 clock periods. In case you want to use OSCB locked, be sure that OSCB is
started before setting LCKEN bit. Then, wait until OSCBRY is set by hardware to be sure
that the accurate frequency is reached.
Mnemonic Description
OSCCEN
OSCARY
OSCBRY
OSCBEN
OSCAEN
LCKEN
Bit
-
-
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Oscillator A Ready
When set, this bit indicates that Oscillator A is ready to be used.
Oscillator B Ready
When set, this bit indicates that Oscillator B is ready to be used in high accurate
mode.
Lock Enable
When set, this bit allows to increase the accuracy of OSCB by locking this
oscillator on external RC time constant.
Enable low power consumption RC oscillator
This bit is used to enable the low power consumption oscillator
0: The oscillator is disabled
1: The oscillator is enabled.
Enable high accuracy RC oscillator
This bit is used to enable the high accurate RC oscillator
0: The oscillator is disabled
1: The oscillator is enabled.
Enable crystal oscillator
This bit is used to enable the crystal oscillator
0: The oscillator is disabled
1: The oscillator is enabled.
OSCARY
5
OSCBRY
4
LCKEN
3
OSCCEN
2
OSCBEN
1
4311C–8051–02/08
OSCAEN
0