USER'S GUIDE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

POWER CONTROL REGISTER

 

 

 

 

 

 

 

 

 

 

Label: PCON

 

 

 

 

 

 

 

 

Register Address: 087H

 

 

D7

D6

 

D5

D4

D3

D2

D1

D0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SMOD

 

POR

 

PFW

WTR

 

EPFW

 

EWT

 

STOP

 

IDL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit Description:

 

 

 

 

 

 

 

 

 

 

 

 

 

PCON.7

 

 

SMOD

 

 

 

 

 

 

 

 

 

 

ªDouble Baud Rateº:

 

When set to a 1, the baud rate is doubled when the serial port is being used

 

 

 

 

in modes 1, 2, or 3.

 

 

 

 

 

 

 

 

Initialization:

 

 

Cleared to a 0 on any reset.

 

 

 

 

 

 

 

 

Read Access:

 

 

Can be read normally at any time.

 

 

 

 

 

 

Write Access:

 

 

Can be written normally at any time.

 

 

 

 

 

 

PCON.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

POR

 

 

 

 

 

 

 

 

 

 

ªPower On Resetº:

 

Indicates that the previous reset was initiated during a Power On sequence.

Initialization:

 

 

Cleared to a 0 when Power On Reset occurs. Remains at 0 until it is set to a 1

 

 

 

 

 

 

by software.

 

 

 

 

 

 

 

 

 

 

Read Access:

 

 

Can be read normally at any time.

 

 

 

 

 

 

Write Access:

 

 

Can be written only by using the Timed Access Register.

 

 

 

 

PCON.5:

 

 

PFW

 

 

 

 

 

 

 

 

 

 

ªPower Fail Warningº:

 

Indicates that a potential power failure is in progress. Set to 1 whenever V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CC

 

 

 

 

 

 

voltage is below the VPFW threshold. Cleared to a 0 immediately following a

 

 

 

 

 

 

read operation of the PCON register. Once set, it will remain set until the

 

 

 

 

 

 

read operation occurs regardless of activity on VCC. After PFW is cleared by

 

 

 

 

 

 

a read, it will return to a 1 if VCC < VPFW.

 

 

 

 

 

 

Initialization:

 

 

Cleared to a 0 during a Power On Reset.

 

 

 

 

 

 

Read Access:

 

 

Can be read normally anytime.

 

 

 

 

 

 

Write Access:

 

 

Not writable.

 

 

 

 

 

 

 

 

 

 

PCON.4:

 

 

WTR

 

 

 

 

 

 

 

 

 

 

ªWatchdog Timer Resetº:

 

Set to a 1 following a Watchdog Timer timeout. If Watchdog Timer Reset is

 

 

 

 

enabled, this will indicate the cause of the reset. Cleared to 0 immediately

 

 

 

 

 

 

following a read of the PCON register.

 

 

 

 

 

 

Initialization:

 

 

Set to a 1 after a Watchdog Timeout Reset. Cleared to a 0 on a Power On

 

 

 

 

 

 

Reset. Remains unchanged during other types of resets.

 

 

 

 

Read Access:

 

 

May be read normally anytime.

 

 

 

 

 

 

Write Access:

 

 

Cannot by written.

 

 

 

 

 

 

 

 

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Mitsubishi DS5000TK, DS907x SIP manual Power Control Register, Label Pcon Register Address 087H