MPC8536-RDK Freescale Semiconductor, MPC8536-RDK Datasheet - Page 1215

Manufacturer Part Number

BOARD REF COMEXPRESS MPC8536

Manufacturer

Freescale Semiconductor

PowerQUICC ™r

CSB1880, CSB1801, Cables, Documentation, Enclosure, Power Supply with cord

For Use With/related Products

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Enhanced Serial Peripheral Interface

The enhanced serial peripheral interface (eSPI) allows the device to exchange data with peripheral devices

such as EEPROMs, real-time clocks, A/D converters, and ISDN devices. The eSPI is a full-duplex,

synchronous, character-oriented channel that supports a simple interface (receive, transmit, clock and chip

selects). The eSPI consists of transmitter and receiver sections, an independent baud-rate generator, and a

control unit. The transmitter and receiver sections use the same clock, which is derived from the eSPI baud

rate generator in master mode. During an eSPI transfer, data is sent and received simultaneously.

The eSPI receiver and transmitter each have a FIFO of 32 bytes, as shown in

18-1. When the eSPI

is disabled in the eSPI mode register (SPMODE[EN] = 0), it consumes little power.

Introduction

The eSPI block diagram is shown in

Peripheral Bus

eSPI Mode Register

Transmit_Register

Receive_Register

Transmit_FIFO

Receiver_FIFO

Shift_Register

CCB clock / 2

Signal Interface

Figure 18-1. eSPI Block Diagram

MPC8536E PowerQUICC III Integrated Processor Reference Manual, Rev. 1

Freescale Semiconductor