ST72C171 datasheet(37/152 Pages) STMICROELECTRONICS

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ST72C171

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7.2.2 Miscellaneous Register 2 (MISCR2)

Miscellaneous register 2 is used to configure of

SPI and the output selection of the PWMs.

—

Read /Write

Reset Value: 0000 0000 (00h)

Bit 7:5 = not used

Bit 4 = SPIOD

SPI output disable

This bit is used to disable the SPI output on the I/O

port (in both master or slave mode).

0: SPI output enabled

1: SPI output disabled

(I/O pin free for general-purpose I/O)

Bit 3 = P1OS

PWM1 output select

This bit is used to select the output for the PWM1

channel of the ART/PWM Timer.

0: PWM1 output on PWM1 pin

1: PWM1 output on PWM1R pin and connected to

the OA2PIN pin

Note: In order to use the PC1 port pin as a PWM

output pin, bit 1 of port C must be programmed as

floating input. This should be done prior to setting

the P1OS bit.

Bit 2 = P0OS

PWM0 output select

This bit is used to select the output for the PWM0

channel of ART/PWM Timer.

0: PWM0 output on PWM0 pin

1: PWM0 output on PWM0R pin and connected to

the OA1PIN pin

Note: In order to use the PC2 port pin as a PWM

output pin, bit 2 of port C must be programmed as

floating input. This should be done prior to setting

the P0OS bit.

Bit 1 = SSM

SS mode selection

It is set and cleared by software.

0: Normal mode - SS uses information coming

from the SS pin of the SPI.

1: I/O mode, the SPI uses the information stored

into bit SSI.

Bit 0 = SSI

SS internal mode

This bit replaces pin SS of the SPI when bit SSM is

set to 1. (see SPI description). It is set and cleared

by software.

SPIOD P1OS P0OS SSM

SSI

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