Mitsubishi DS907x SIP User Manual page 31

POWER CONTROL REGISTER
Label: PCON
D7 D6
SMOD POR
Bit Description:
PCON.7
"Double Baud Rate":
Initialization:
Read Access:
Write Access:
PCON.6
"Power On Reset":
Initialization:
Read Access:
Write Access:
PCON.5:
"Power Fail Warning":
Initialization:
Read Access:
Write Access:
PCON.4:
"Watchdog Timer Reset":
Initialization:
Read Access:
Write Access:
D5 D4
PFW WTR
SMOD
When set to a 1, the baud rate is doubled when the serial port is being used
in modes 1, 2, or 3.
Cleared to a 0 on any reset.
Can be read normally at any time.
Can be written normally at any time.
POR
Indicates that the previous reset was initiated during a Power On sequence.
Cleared to a 0 when Power On Reset occurs. Remains at 0 until it is set to a 1
by software.
Can be read normally at any time.
Can be written only by using the Timed Access Register.
PFW
Indicates that a potential power failure is in progress. Set to 1 whenever V
voltage is below the V
PFW
read operation of the PCON register. Once set, it will remain set until the
read operation occurs regardless of activity on V
a read, it will return to a 1 if V
Cleared to a 0 during a Power On Reset.
Can be read normally anytime.
Not writable.
WTR
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.
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.
May be read normally anytime.
Cannot by written.
Register Address: 087H
D3 D2
EPFW EWT
threshold. Cleared to a 0 immediately following a
CC
< V .
CC PFW
31
USER'S GUIDE
D1
STOP
CC
. After PFW is cleared by
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D0
IDL