rej05b0651_sh7618ap| Application Note
APPLICATION NOTE
SH7618 Group
HIF Boot Mode
Introduction
The SH7618 integrates an Ethernet controller module and HIF (Host Interface) module, which makes connection to another microcomputer easier, with the RISC-type SH-2 CPU core (RISC: Reduced Instruction Set Computer). The HIF module facilitates the transfer of data between devices connected to the HIF. A feature of the HIF is the HIF boot mode, in which the SH7618 is started up by a boot program stored in the HIFRAM (internal RAM used exclusively by the HIF). When the boot program is used as a data transfer program, an external device can transfer application programs to the SH7618 via the HIFRAM. A transferred application program is stored in SH7618 internal RAM or RAM connected to the SH7618 external bus. Transferring application programs from an external device to the SH7618 eliminates the need for program storage ROM for the SH7618. This application note describes the startup method in the HIF boot mode, and therefore may be useful for designing user software. Although the operation of the programs describ
ed in this application note has been verified, always conduct an operation check in your operating environment before using them.
Target Device
SH7618
Contents
1. 1.1 1.2 1.3 2. 2.1 2.2 2.3 Overview of the HIF .......................................................................................................................... 2 HIF Features ..................................................................................................................................... 2 Access from an External Device ....................................................................................................... 4 HIF Boot Mode .................................................................................................................................. 9 Examples of Using HIF Boot Mode................................................................................................. 11 Startup in HIF Boot Mode ............................................................................................................... 11 Program Transfer to Internal RAM in HIF Boot Mode .................................................................... 22 Program Transfer Usin
g Two Banks of HIFRAM............................................................................ 48
REJ05B0651-0100
September 2005
Page 1 of 77
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