CP3SP33SMSSLASHNOPB datasheet(286/407 Pages) TI1

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MDIDO

MDODI

I/O

Lines

I/O

Lines

MDODI

MSK

Master

8-Bit

A/D

Slave

GPIO

MWCS

1K Bit

EEPROM

LCD

Display

Driver

Display

Driver

DS067

CP3SP33

SNOSCW5 – MAY 2013

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28 Dual Microwire/SPI Interfaces

Microwire/Plus is a synchronous serial communications protocol, originally implemented in National

Semiconduc- tor's COPS® and HPC families of microcontrollers to mini- mize the number of connections,

and therefore the cost, of communicating with peripherals.

The CP3SP33 has an Microwire/SPI interface module (MWSPI) that can communicate with all peripherals

that conform to Microwire/Plus or Serial Peripheral Interface (SPI) specifications. This Microwire interface

is capable of operating as either a master or slave and in 8- or 16-bit mode. Figure 101 shows a typical

Microwire interface appli- cation.

Two modules are provided: module 0 on the CPU APB bus and module 1 on the shared audio peripheral

APB bus. Module 1 can be accessed by either the CPU or DSP, so its interrupt and DMA request signals

are routed through the ASC module.

The Microwire interface module includes the following fea- tures:

•

Programmable operation as a master or slave

•

Programmable shift-clock frequency (master only)

•

Programmable 8- or 16-bit mode of operation

•

8- or 16-bit serial I/O data shift register

•

Two modes of clocking data

•

Serial clock can be low or high when idle

•

16-bit read buffer

•

Busy bit, Read Buffer Full bit, and Overrun bit for polling and as interrupt sources

•

Supports multiple masters

•

DMA capability

•

Maximum bus clock frequency of 12 MHz running from a 48 MHz PCLK Clock

•

Supports very low-end slaves with the Slave Ready output

•

Echo back enable/disable (slave only)

Figure 28-1. Microwire Interface

28.1 Microwire Operation

The Microwire interface allows several devices to be connected on one three-wire system. At any given

time, one of these devices operates as the master while all other devices operate as slaves. The

Microwire interface allows the device to operate either as a master or slave transferring 8-bits or 16-bits of

data.

286

Dual Microwire/SPI Interfaces

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