AN2021 datasheet(17/39 Pages) STMICROELECTRONICS

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AN2021

Modified features

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Example for RTCSIR flag

Replace ST10F269 code:

RTCCON &= 0xFFFE;// Clear RTCSIR flag

by the following code for ST10F272:

RTCCON |= 0x0001;// Write 1 into RTCSIR flag to clear it

1.6

CAN modules

The ST10F269 has two CAN modules of the B-CAN type.

The ST10F272 has two CAN modules of the C-CAN type. These modules are functionally

compatible with the modules of the ST10F269.

The C-CAN cells provide additional Message Objects and new functionalities. The main

difference is that the Message Objects are no longer directly accessed as memory but are

available through a Message Interface. This changes the programming model of the

modules.

1.6.1

Hardware impact

None.

1.6.2

Software impact

Rewrite the CAN drivers.

1.7

Port input control

In the ST10F269, the Port Input Control register PICON is used to select between TTL and

CMOS-like input thresholds. The CMOS-like input thresholds are defined above the TTL

levels and feature a hysteresis of 250mV to prevent the inputs from toggling while the

respective input signal level is near the thresholds. This feature is available for all pins of

Port 2, Port 3, Port4, Port 7 and Port 8.

In the ST10F272, Port 6 has been added. Moreover, the default hysteresis is now 500mV for

TTL levels and 800mV for CMOS levels.

ST10F269: PICON (F1C4h / E2h)

ESFR

Reset value: --00h

98765

4321

Reserved

LIN

Res.

LIN

HIN

LIN

HIN

LIN

R/W

ST10F272: PICON (F1C4h / E2h)

ESFR

Reset value: 0000h

Reserved

LIN

HIN

LIN

HIN

LIN

R/W

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