h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 576
h8s-2161b
Manufacturer Part Number
h8s-2161b
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2161B.pdf
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Section 18 Host Interface X-Bus Interface (XBS)
command is detected, bit 1 of the data following the host command is output from the GA20
output pin. This operation does not depend on firmware or interrupts, and is faster than the regular
processing using interrupts. Table 18.5 lists the conditions that set and clear GA20 (P81). Figure
18.2 shows the GA20 output in flowchart form. Table 18.6 indicates the GA20 output signal
values.
Table 18.5 GA20 (P81) Set/Clear Timing
Pin Name
GA20
(P81)
Rev. 3.00 Mar 21, 2006 page 522 of 788
REJ09B0300-0300
Setting Condition
Rising edge of the host’s write signal
(IOW) when bit 1 of the written data is 1
and the data follows an H'D1 host
command
No
No
Figure 18.2 GA20 Output
Write bit 1 of data byte
to DR bit of P81/GA20
Wait for next byte
H'D1 command
Data byte?
received?
Start
Yes
Yes
Host write
Host write
Clearing Condition
Rising edge of the host’s write signal
(IOW) when bit 1 of the written data is 0
and the data follows an H'D1 host
command
Also, when bit FGA20E in HICR is cleared
to 0
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