SH7262/SH7264 Group

High-speed Read/Write Serial Flash Memory

Using the Renesas Serial Peripheral Interface

REJ06B0889-0100/Rev.1.00

June 2009

Page 3 of 45

2.

Applications

Connect the SH7264 MCU (Master) with the SPI-compatible serial flash memory (Slave) for read/write access using the

Renesas Serial Peripheral Interface (RSPI). This application accesses serial flash memory in high-speed for large volume

data.

This chapter describes the pin connection example and flow charts of the sample program.

2.1

RSPI Operation

SH7264 RSPI supports full-duplex, synchronous, serial communications with peripheral devices in SPI operation using the

MOSI (Master Out Slave In), MISO (Master In Slave Out), SSL (Slave Select), and RSPCK (SPI Clock) pins.

The RSPI has the following features to support SPI-compliant devices:

• Master/slave modes

• Serial transfer clock with programmable polarity and phase (change SPI modes)

• Transfer bit length selectable (8-bit, 16-bit, and 32-bit)

The RSPI has two channels, channel 0 and channel 1; this application uses channel 0.

2.2

Serial Flash Memory Pin Connection

The following table lists the specifications of the SPI-compliant serial flash memory (AT26DF161A, ATMEL) used in this

application.

Table 1 Serial Flash Memory Specifications

Item

Description

SPI modes

Supports SPI modes 0 and 3

Clock frequency

70 MHz (at maximum)

Capacity

2 MB

Sector size

64 KB

Page size

256 bytes

Erase architecture

Chip Erase, 64 KB, 32 KB, 4 KB

Programming options

Byte/Page Program (1 to 256 bytes), Sequential Program

Protect feature

In sectors

Figure 1 shows an example of serial flash memory circuit. Set the SH7264 pin functions as shown in Table 2.