MSM80C154S/83C154S/85C154HVS

4.4.2.2 Power control register (PCON)

Name

Address

MSB

 

 

 

 

 

 

 

 

 

 

 

LSB

7

 

6

 

5

 

4

3

 

2

 

1

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PCON

87H

SMOD

 

HPD

 

RPD

 

GF1

 

GF0

 

PD

 

IDL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit location

Flag

 

 

 

 

 

 

Function

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PCON.0

IDL

IDLE mode set when this bit is set to "1". CPU operations are

 

 

stopped when IDLE mode is set, but XTAL1·2, timer/counters 0, 1,

 

 

and 2, the interrupt circuits, and serial port remain active. IDLE

 

 

mode is cancelled when the CPU is reset or when an interrupt is

 

 

generated.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PCON.1

PD

PD mode set when this bit is set to "1". CPU operations and

 

 

 

XTAL1·2 are stopped when PD mode is set. PD mode is cancelled

 

 

when the CPU is reset or when an interrupt is generated.

 

 

 

 

PCON.2

GF0

User flag. Testing this flag when IDLE mode is cancelled by an

 

 

interrupt shows whether the interrupt is a normal interrupt or an

 

 

IDLE mode release interrupt.

 

 

 

 

 

 

 

 

 

 

PCON.3

GF1

User flag. Testing this flag when PD mode is cancelled by an

 

 

interrupt shows whether the interrupt is a normal interrupt or a PD

 

 

mode release interrupt.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PCON.4

Reserved bit. The output data is "1" if the bit is read.

 

 

 

 

 

 

PCON.5

RPD

Bit used to specify cancellation of CPU power down mode (IDLE

 

 

or PD) by interrupt signal.

 

 

 

 

 

 

 

 

 

 

Power down mode cannot be cancelled by interrupt signal if

 

 

 

interrupt is not enabled by IE (interrupt enable register) when this

 

 

bit is "0".

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If the interrupt flag is set to "1" by an interrupt request signal when

 

 

this bit is "1" (even if interrupt is disabled), the program is executed

 

 

from the next address of the power down mode setting instruction.

 

 

The flag is reset to "0" by software.

 

 

 

 

 

 

 

 

 

PCON.6

HPD

The hard power down setting mode is enabled when this bit is set

 

 

to "1".

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If the level of the power failure detect signal applied to the HPDI

 

 

pin (pin 3.5) is changed from "1" to "0" when this bit is "1",

 

 

 

XTAL1·2 oscillation is stopped and the system is put into hard

 

 

power down mode.

 

 

 

 

 

 

 

 

 

 

 

PCON.7

SMOD

When the serial port is used in mode 1, 2 or 3, this bit has the

 

 

following functions. The serial port operation clock is reduced by

 

 

1/2 when the bit is "0" for delayed processing. And when the bit is

 

 

"1", the serial port operation clock is normal for faster processing.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Sonic Alert msm83c154s, msm80154s, msm85c154hvs user manual MSM80C154S/83C154S/85C154HVS Power control register Pcon