h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 620

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 18A Host Interface X-Bus Interface (XBS)
Bit 0—Output Buffer Full (OBF): Set to 1 when the slave processor writes to ODR1. Cleared to
0 when the host processor reads ODR.
Bit 0
OBF
0
1
Table 18A.3 shows the conditions for setting and clearing the STR flags.
Table 18A.3 Set/Clear Timing for STR Flags
Flag
C/D
IBF *
OBF
Note:
Rev. 3.00 Jan 18, 2006 page 592 of 1044
REJ09B0280-0300
* The IBF flag setting and clearing conditions are different when the fast A20 gate is
used. For details see table 18A.7.
Description
[Clearing condition]
When the host processor reads ODR or the slave writes 0 in the OBF bit (Initial value)
[Setting condition]
When the slave processor writes to ODR
Setting Condition
Rising edge of host’s write signal
(IOW) when HA0 is high
Rising edge of host’s write signal
(IOW) when writing to IDR1
Falling edge of slave’s internal write
signal (WR) when writing to ODR1
Clearing Condition
Rising edge of host’s write signal (IOW) when
HA0 is low
Falling edge of slave’s internal read signal (RD)
when reading IDR1
Rising edge of host’s read signal (IOR) when
reading ODR1