ST40RA datasheet(29/94 Pages) STMICROELECTRONICS

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5 System configuration

ST40RA

29/94

STMicroelectronics

ADCS 7260755H

5.9.6

PIO alternate functions

The function of pads with PIO alternate functions are controlled by the PIO.PC0, PIO.PC1 and

PIO.PC2 registers.

In the ST40RA device, the operational modes for these registers differ from the standard

architecture definition and are shown in

Table 12.

[44:46]

EMPI_CS_ENB

Enable EMPI chip selection alternate function

000: NOTESC0 remapped to NOTEMPICS

001: NOTESC1 remapped to NOTEMPICS

010: NOTESC2 remapped to NOTEMPICS

011: NOTESC3 remapped to NOTEMPICS

100: NOTESC4 remapped to NOTEMPICS

101: NOTESC5 remapped to NOTEMPICS

110: Reserved

111: Disabled (value at reset)

SEL_EXT_EMI_SLAVE

Select EMI slave or master functionality

0: EMI is bus master

1: EMI is bus slave

[48:59]

Reserved

[60:63]

PIO_CONF

PIO bit configuration

PIO output state

PIO.PC2

PIO.PC1

PIO.PC0

NonPIO functiona

a. State following reset

-0

PIO bidirectional

Open drain

PIO output

Push-pull

PIO bidirectional

Open drain

PIO input

High impedance

PIO input

High impedance

Reserved

Table 12: PIO alternate function registers

SYSCONF.SYS_CON2

Functional pin use and behavior

0x0018

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