Datasheet

Section 22 Flash Memory
R01UH0309EJ0500 Rev. 5.00 Page 1173 of 1408
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
(2) Bit-Rate-Adjustment State
The bit rate is calculated by measuring the period of transfer of a low-level byte (H'00) from the
host. The bit rate can be changed by the command for a new bit rate selection. After the bit rate
has been adjusted, the boot program enters the inquiry and selection state. The bit-rate-adjustment
sequence is shown in figure 22.11.
Host Boot Program
H'00 (30 times maximum)
H'E6 (Boot response)
Measuring the
1-bit length
H'00 (Completion of adjustment)
H'55
H'FF (error)
Figure 22.11 Bit-Rate-Adjustment Sequence