EM357-RTR datasheet(78/240 Pages) ETC2

78 / 240 page

EM351 / EM357

8-7

120-035X-000D

Preliminary

The GPIO pins used for these signals are shown in Table 8-3. Additional outputs may be needed to drive the

nSSEL signals on slave devices.

Table 8-3. SPI Master GPIO Usage

MOSI

MISO

SCLK

Direction

Output

Input

Output

GPIO Configuration

Alternate Output

(push-pull)

Input

Alternate Output

(push-pull)

SC1 pin

PB1

PB2

PB3

SC2 pin

PA0

PA1

PA2

8.3.2

Set Up and Configuration

Both serial controllers, SC1 and SC2, support SPI master mode. SPI master mode is enabled by the following

The serial controller mode register (SCx_MODE) is 2.

The SC_SPIMST bit in the SPI configuration register (SCx_SPICFG) is 1.

The SPI serial clock (SCLK) is produced by a programmable clock generator. The serial clock is produced by

dividing down 12 MHz according to this equation:

EXP

LIN

rate

)

(

MHz

EXP is the value written to the SCx_RATEEXP register and LIN is the value written to the SCx_RATELIN register.

The SPI master mode clock may not exceed 12 Mbps, so EXP and LIN cannot both be zero.

The SPI master controller supports various frame formats depending upon the clock polarity (SC_SPIPOL),

clock phase (SC_SPIPHA), and direction of data (SC_SPIORD) (see Table 8-4). The bits SC_SPIPOL, SC_SPIPHA,

and SC_SPIORD are defined within the SCx_SPICFG register.

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