Hitachi H8S/2633 Hardware Manual page 813

Bit 3—Flash Memory Control Register Enable (FLSHE): Controls CPU access to the flash

memory control registers (FLMCR1, FLMCR2, EBR1, and EBR2). Setting the FLSHE bit to 1

enables read/write access to the flash memory control registers. If FLSHE is cleared to 0, the flash

memory control registers are deselected. In this case, the flash memory control register contents

are retained.

Flash control registers deselected in area H'FFFFA8 to H'FFFFAC

Flash control registers selected in area H'FFFFA8 to H'FFFFAC

Bits 2 to 0—Reserved: Should always be written with 0.

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

22-6. For a diagram of the transitions to the various flash memory modes, see figure 22-2.

Table 22-6 Setting On-Board Programming Modes

User program 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 H8S/2633 Series' pins have been set to boot mode, the

boot program built into the H8S/2633 Series is started and the programming control program

prepared in the host is serially transmitted to the H8S/2633 Series via the SCI. In the H8S/2633

Series, 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).

Expanded mode

Single-chip mode

Expanded mode

Single-chip mode

(Initial value)