PIC32MX440F256H-80I Datasheet, PDF (410/646 Pages) Microchip Technology – 64/100-Pin General Purpose and USB 32-Bit Flash Microcontrollers

PIC32MX3XX/4XX
17.4 I/O Pin Control
Enabling the SPI modules will configure the I/O pin
direction as defined by the SPI control bits (see
Table 17-7). The port TRIS and LATCH registers will be
overridden.
TABLE 17-7: I/O PIN CONFIGURATION FOR USE WITH SPI MODULES
Required Settings for Module Pin Control
IO Pin Name Required
Module
Control⁽³⁾
Bit
Field⁽³⁾
TRIS^{(4) Pin Type}
Buffer Type
Description
SCK1, SCK2
Yes
ON
and
MSTEN
—
X
O
CMOS
SPI1, SPI2 module Clock
Output in Master Mode.
SCK1, SCK2
SDI1, SDI2
SDO1, SDO2
Yes
Yes
Yes⁽¹⁾
ON
and
MSTEN
ON
—
X⁽⁵⁾
I
—
X⁽⁵⁾
I
ON
DISSDO
X
O
CMOS
CMOS
CMOS
SPI1, SPI2 module Clock
Input in Slave Mode.
SPI1, SPI2 module Data
Receive pin.
SPI1, SPI2 module Data
Transmit pin.
SS1, SS2
Yes⁽²⁾
ON
and
FRMEN
and
MSTEN
SSEN
X⁽⁵⁾
I
CMOS
SPI1, SPI2 module Slave
Select Control pin.
SS1, SS2
ON
Yes
and
—
X⁽⁵⁾
I
FRMEN
and
FRMSYNC
CMOS
SPI1, SPI2 Frame Sync
Pulse input in Frame Mode.
SS1, SS2
ON
Yes
and
—
X
O
CMOS SPI1,SPI2 Frame Sync
FRMEN
Pulse output in Frame Mode.
and
FRMSYNC
Legend: CMOS = CMOS compatible input or output; ST = Schmitt Trigger input with CMOS levels; I = Input;
O = Output; X = Don’t Care
Note 1: The SDO pins are only required when SPI data output is needed. Otherwise, these pins can be used for
general purpose I/O and require the user to set the corresponding TRIS control register bits.
2: The Slave Select pins are only required when a select signal to the slave device is needed. Otherwise,
these pins can be used for general purpose I/O and require the user to set the corresponding
TRIS control register bits.
3: These bits are contained in the SPIxCON register.
4: The setting of the TRIS bit is irrelevant.
5: If the input pin is shared with an analog input, then the AD1PCFG and the corresponding TRIS register
have to be properly set to configure this input as digital.
DS61143E-page 408
Preliminary
© 2008 Microchip Technology Inc.