TS80C32X2-VCKB datasheet(31/54 Pages) TEMIC

31 / 54 page

Rev. B - Jan. 25, 1999

Preliminary

TS80C52X2

6.9 Power-Off Flag

The power-off flag allows the user to distinguish between a “cold start” reset and a “warm start” reset.

A cold start reset is the one induced by VCC switch-on. A warm start reset occurs while VCC is still applied to

the device and could be generated for example by an exit from power-down.

The power-off flag (POF) is located in PCON register (See Table 16.). POF is set by hardware when VCC rises

from 0 to its nominal voltage. The POF can be set or cleared by software allowing the user to determine the type

of reset.

Table 16. PCON Register

PCON - Power Control Register (87h)

Reset Value = 00X1 0000b

Not bit addressable

SMOD1

SMOD0

POF

GF1

GF0

IDL

Bit

Number

Bit

Mnemonic

Description

SMOD1

Serial port Mode bit 1

Set to select double baud rate in mode 1, 2 or 3.

SMOD0

Serial port Mode bit 0

Clear to select SM0 bit in SCON register.

Set to to select FE bit in SCON register.

Reserved

The value read from this bit is indeterminate. Do not set this bit.

POF

Power-Off Flag

Clear to recognize next reset type.

Set by hardware when VCC rises from 0 to its nominal voltage. Can also be set by software.

GF1

General purpose Flag

Cleared by user for general purpose usage.

Set by user for general purpose usage.

GF0

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.

IDL

Idle mode bit

Clear by hardware when interrupt or reset occurs.

Set to enter idle mode.

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