HD6432621 Hitachi, HD6432621 Datasheet - Page 675

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

19.6
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
19-6. For a diagram of the transitions to the various flash memory modes, see figure 19-2.
Table 19-6 Setting On-Board Programming Modes
Mode
Boot mode
User program mode
19.6.1
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/2626 or H8S/2623 pins have been set to boot mode,
the boot program built into the LSI is started and the programming control program prepared in
the host is serially transmitted to the LSI via the SCI. In the H8S/2626 and H8S/2623, 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 19-6, and the boot mode execution
procedure in figure 19-7.
On-Board Programming Modes
Boot Mode
Expanded mode
Single-chip mode
Expanded mode
Single-chip mode
FWE
1
1
MD2
0
0
1
1
MD1
1
1
1
1
MD0
0
1
0
1
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