ST72104GX datasheet(38/141 Pages) STMICROELECTRONICS

38 / 141 page

ST72104Gx, ST72215Gx, ST72216Gx, ST72254Gx

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MISCELLANEOUS REGISTERS (Cont’d)

MISCELLANEOUS REGISTER 2 (MISCR2)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:4 = Reserved always read as 0

Bit 3 = MOD SPI Master Output Disable

This bit is set and cleared by software. When set, it

disables the SPI Master (MOSI) output signal.

0: SPI Master Output enabled.

1: SPI Master Output disabled.

Bit 2 = SOD SPI Slave Output Disable

This bit is set and cleared by software. When set it

disable the SPI Slave (MISO) output signal.

0: SPI Slave Output enabled.

1: SPI Slave Output disabled.

Bit 1 = SSM SS mode selection

This bit is set and cleared by software.

0: Normal mode - the level of the SPI SS signal is

input from the external SS pin.

1: I/O mode, the level of the SPI SS signal is read

from the SSI bit.

Bit 0 = SSI SS internal mode

This bit replaces the SS pin of the SPI when the

SSM bit is set to 1. (see SPI description). It is set

and cleared by software.

Table 10. Miscellaneous Register Map and Reset Values

MOD SOD

SSM

SSI

Address

(Hex.)

Label

0020h

MISCR1

Reset Value

IS11

IS10

MCO

IS01

IS00

CP1

CP0

SMS

0040h

MISCR2

Reset Value

MOD

SOD

SSM

SSI

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