Idle and Power Down Operation
Idle mode allows the interrupt, serial port and timer blocks to continue to operate while
the clock of the CPU is gated off.
Power down mode stops the oscillator.
Table 1.
PCON Register
PCON - Power Control Register
7
SMOD
Bit
Number
7
6
5
4
Bit
Mnemonic
SMOD
-
-
-
Description
Double Baud Rate bit
Set to select double baud rate in mode 1, 2 or 3.
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.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
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
Clear by hardware when interrupt or reset occurs.
Set to enter idle mode.
6
-
5
-
4
-
3
GF1
2
GF0
1
PD
0
IDL
3
GF1
2
GF0
1
PD
0
IDL
Reset Value = 000X 0000
Not bit addressable
6
80C32E
Rev. K – 21-Aug-01
ATMEL [ ATMEL CORPORATION ]
