SH7052 datasheet(729/919 Pages) RENESAS

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20.6

On-Board Programming Modes

When pins are set to on-board programming mode and a reset-start is executed, a transition is

made to the on-board programming state in which program/erase/verify operations can be

performed on the on-chip flash memory. There are two on-board programming modes: boot mode

and user program mode. The pin settings for transition to each of these modes are shown in table

20.6. For a diagram of the transitions to the various flash memory modes, see figure 20.2.

Table 20.6

Setting On-Board Programming Modes

Mode

PLL Multiple

FWE

MD2

MD1

MD0

Boot mode

Expanded mode

× 4

1100

Single-chip mode

User program

Expanded mode

1110

mode

Single-chip mode

20.6.1

Boot Mode

When boot mode is used, the flash memory programming control program must be prepared in the

host beforehand. The SCI channel to be used is set to asynchronous mode.

When a reset-start is executed after the SH7052F/SH7053F’s pins have been set to boot mode, the

boot program built into the SH7052F/SH7053F is started and the programming control program

prepared in the host is serially transmitted to the SH7052F/SH7053F via the SCI. In the

SH7052F/SH7053F, the programming control program received via the SCI is written into the

programming control program area in on-chip RAM. After the transfer is completed, control

branches to the start address of the programming control program area and the programming

control program execution state is entered (flash memory programming is performed).

The transferred programming control program must therefore include coding that follows the

programming algorithm given later.

The system configuration in boot mode is shown in figure 20.8, and the boot mode execution

procedure in figure 20.9.

SH7052 Datasheet(PDF) 729 Page - Renesas Technology Corp