HD6433644R datasheet(143/549 Pages) RENESAS

143 / 549 page

Section 6 ROM

Rev. 6.00 Sep 12, 2006 page 123 of 526

REJ09B0326-0600

Table 6.10 System Clock Oscillation Frequencies Permitting Automatic Adjustment of

Chip (H8/3644F, H8/3643F, H8/3642AF) Bit Rate

Host Bit Rate*

System Clock Oscillation Frequencies (fOSC) Permitting Automatic

Adjustment of Chip (H8/3644F, H8/3643F, H8/3642AF) Bit Rate

9600 bps

8 MHz to 16 MHz

4800 bps

4 MHz to 16 MHz

2400 bps

2 MHz to 16 MHz

Note:

* Use a host bit rate setting of 2400, 4800, or 9600 bps only. No other setting should be

used.

RAM Area Allocation in Boot Mode: In boot mode, the 96-byte area from H'FB80 to H'FBDF

and the 18-byte area from H'FF6E to H'FF7F are reserved for boot program use, as shown in

figure 6.11. The area to which the user program is transferred is H'FBE0 to H'FF6D (910 bytes).

The boot program area becomes available when a transition is made to the execution state for the

user program transferred to RAM. A stack area should be set within the user program as required.

H'FF6E

H'FF7F

H'FB80

Boot program

area*

(96 bytes)

Boot program

area*

(18 bytes)

User program

transfer area

(910 bytes)

H'FBE0

These areas cannot be used until a transition is made to the execution state for the user

program transferred to RAM (i.e. a branch is made to RAM address H'FBE0). Note also

that the boot program remains in the boot program area in RAM (H'FB80 to H'FBDF,

H'FF6E to H'FF7F) even after control branches to the user program. When an interrupt

handling routine is executed in the boot program, the 16 bytes from H'FB80 to H'FB8F in

this area cannot be used. For details see section 6.7.9, Interrupt Handling during Flash

Memory Programming/Erasing.

Note: *

Figure 6.11 RAM Areas in Boot Mode

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