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HD6432147SW Datasheet(PDF) 206 Page - Renesas Technology Corp

Part # HD6432147SW
Description  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
PDF  1177 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6432147SW Datasheet(HTML) 206 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev. 4.00 Sep 27, 2006 page 162 of 1130
REJ09B0327-0400
6.4.3
Valid Strobes
Table 6.5 shows the data buses used and valid strobes for the access spaces.
In a read, the
RD signal is valid without discrimination between the upper and lower halves of the
data bus.
In a write, the
HWR signal is valid for the upper half of the data bus, and the LWR signal for the
lower half.
Table 6.5
Data Buses Used and Valid Strobes
Area
Access
Size
Read/
Write
Address
Valid
Strobe
Upper Data Bus
(D15 to D8)
Lower Data Bus
(D7 to D0)
Byte
Read
—
RD
Valid
Port, etc.
8-bit access
space
Write
—
HWR
Port, etc.
Byte
Read
Even
RD
Valid
Invalid
16-bit access
space
Odd
Invalid
Valid
Write
Even
HWR
Valid
Undefined
Odd
LWR
Undefined
Valid
Word
Read
—
RD
Valid
Valid
Write
—
HWR, LWR Valid
Valid
Legend:
Undefined: Undefined data is output.
Invalid:
Input state; input value is ignored.
Port, etc.:
Pins are used as port or on-chip supporting module input/output pins, and not as data
bus pins.



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