T80C5112-RKFEV datasheet(18/97 Pages) ATMEL

18 / 97 page

Rev. B - November 10, 2000

Preliminary

T80C5112

7.6. Registers

7.6.1. PCON: Power configuration register

Table 4. PCON Register

PCON (S:87h)

Power conÞguration Register

Reset Value= 0000 0000b

7.7. Port pins

The value of port pins in the different operating modes is shown on the figure below.

Table 5. Pin Conditions in Special Operating Modes

SMOD1

SMOD0

RSTD

POF

GF1

GF0

IDL

Bit

Number

Bit

Mnemonic

Description

SMOD1

Double Baud Rate bit

Set to double the Baud Rate when Timer 1 is used and mode 1, 2 or 3 is selected in SCON register.

SMOD0

SCON Select bit

When cleared, read/write accesses to SCON.7 are to SM0 bit and read/write accesses to SCON.6 are to SM1 bit.

When set, read/write accesses to SCON.7 are to FE bit and read/write accesses to SCON.6 are to OVR bit.

SCON is Serial Port Control register.

RSTD

Reset Detector Disable bit

Clear to disable the Power-Fail detector.

Set to enable the Power-Fail detector.

POF

Power-Off flag

Set by hardware when VDD rises above VRET+ to indicate that the Power Supply has been set off.

Must be cleared by software.

GF1

General Purpose flag 1

One use is to indicate wether an interrupt occurred during normal operation or during Idle mode.

GF0

General Purpose flag 0

One use is to indicate wether an interrupt occurred during normal operation or during Idle mode.

Power-Down Mode bit

Cleared by hardware when an interrupt or reset occurs.

Set to activate the Power-Down mode.

If IDL and PD are both set, PD takes precedence.

IDL

Idle Mode bit

Cleared by hardware when an interrupt or reset occurs.

Set to activate the Idle mode.

If IDL and PD are both set, PD takes precedence.

Mode

Program

Memory

Port 1 pins

Port 3 pins

Port 4 pins

Reset

DonÕt care

Weak High

Idle

Internal

Data

Power-Down

Internal

Data

T80C5112-RKFEV 数据表(PDF) 18 Page - ATMEL Corporation

T80C5112-RKFEV 数据表(HTML) 18 Page - ATMEL Corporation

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