SH7052 datasheet(779/919 Pages) RENESAS

779 / 919 page

753

21.6

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

21.6. For a diagram of the transitions to the various flash memory modes, see figure 21.2.

Table 21.6

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

21.6.1

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 SH7054F’s pins have been set to boot mode, the boot

program built into the SH7054F is started and the programming control program prepared in the

host is serially transmitted to the SH7054F via the SCI. In the SH7054F, 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 21.8, and the boot mode execution

procedure in figure 21.9.

SH7052 Datasheet(PDF) 779 Page - Renesas Technology Corp