AN2556 datasheet(19/35 Pages) STMICROELECTRONICS

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AN2556

New features

19/35

New features

2.1

Additional XPeripherals

Some peripherals have been added to ST10F273Z4. They are mapped on the XBus and are

linked to additional alternate functions of some ports.

The additional XPeripherals include the following:

●

A second SSC (SSC of ST10F269Zx becomes SSC0, while the new one is referred to

as XSSC or SSC1). Note that some restrictions and functional differences due to the

XBus peculiarities are present between the classic SSC and the new XSSC.

●

A second ASC (ASC0 of ST10F269Zx remains ASC0, while the new one is referred to

as XASC or ASC1). Note that some restrictions and functional differences due to the

XBus peculiarities are present between the classic ASC and the new XASC.

●

An I2C interface is added (see X-I2C or I2C interface).

In addition to the above XPeripherals, ST10F273Z4 also features a second PWM (PWM of

the ST10F269Zx becomes PWM0, while the new one is referred to as XPWM or PWM1).

Note that some restrictions and functional differences due to the XBus peculiarities are

present between the classic PWM and the new XPWM.

2.1.1

Hardware impacts

None if the additional XPeripherals are not used.

2.1.2

Software impacts

None, if the additional Peripherals are not used. As they are XPeripherals, they can be

enabled/disabled via the XPERCON and SYSCON registers. By default, the setting of

XPERCON and SYSCON is compatible with ST10F269Zx.

2.2

Programmable divider on CLKOUT

A specific register mapped on the X-Bus allows the user to choose the division factor on the

CLKOUT signal (P3.15).

XCLKOUTDIV (E902h)

XBUS

Reset value: --00h

987

65432

Reserved

DIV

-RW

Table 12.

XCLKOUTDIV register: DIV bit

Bit

Function

DIV

fclkout = fCPU/(DIV + 1)

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