AN2169 datasheet(21/33 Pages) STMICROELECTRONICS

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AN2169

Modified registers

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Reset Value: 0000h

3.2.1

Hardware impact

The CMOS levels of the 2 devices are slightly different, therefore the circuitry must be checked

to verify that the new levels can still match the requirements.

3.2.2

Software impact

The high byte of the PICON register is reserved on the ST10F276. Check that the ST10F168

was not writing in bits P4LIN and P6LIN of PICON which are no longer reserved on the

ST10F276.

3.3

IDCHIP register

A new field has been added inside the IDCHIP register to distinguish the different peripheral

options.

ST10F168: IDCHIP (F07Ch)

ESFR

Reset Value: 10DXh

P8LIN

P7LIN

P6LIN

P4LIN

P3HIN

P3LIN

P2HIN

P2LIN

Bit Name

Function

PxLIN

Port x Low Byte Input Level Selection

0: Pins Px.7..0 switch on standard TTL input levels

1: Pins Px.7..0 switch on CMOS input levels

PxHIN

Port x High Byte Input Level Selection

0: Pins Px.15..8 switch on standard TTL input levels

1: Pins Px.15..8 switch on CMOS input levels

PxLOUT

Port x Low Byte Output Driver Characteristic selection

0: Pins Px.7...0 output driver strength is reduced after reaching VOL or

VOH

1: Pins Px.7...0 output drive is not reduced after reaching VOL or VOH

Only for

ST10F168

PxHOUT

Port x High Byte Output Driver Characteristic selection

0: Pins Px.15...8 output driver strength is reduced after reaching VOL or

VOH

1: Pins Px.15...8 output drive is not reduced after reaching VOL or VOH

Only for

ST10F168

CHIPID

REVID

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