h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 588

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 17 Host Interface [H8S/2138 Group]
Bit 1—Input Buffer Full (IBF): Set to 1 when the host processor writes to IDR2. This bit is an
internal interrupt source to the slave processor. IBF is cleared to 0 when the slave processor reads
IDR2.
The IBF flag setting and clearing conditions are different when the fast A20 gate is used. For
details see table 17.8, Fast A20 Gate Output Signals.
Bit 1
IBF
0
1
Bit 0—Output Buffer Full (OBF): Set to 1 when the slave processor writes to ODR2. Cleared to
0 when the host processor reads ODR2. The IBF flag setting and clearing conditions are different
when the fast A20 gate is used. For details see table 17.8, Fast A20 Gate Output Signals.
Bit 0
OBF
0
1
Table 17.4 shows the conditions for setting and clearing the STR2 flags.
Rev. 4.00 Jun 06, 2006 page 534 of 1004
REJ09B0301-0400
Description
[Clearing condition]
When the slave processor reads IDR2
[Setting condition]
When the host processor writes to IDR2
Description
[Clearing condition]
When the host processor reads ODR2 or the slave writes 0 in the OBF bit
[Setting condition]
When the slave processor writes to ODR2
(Initial value)
(Initial value)