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H8S/2214 Scheda tecnica(PDF) 201 Page - Renesas Technology Corp

Il numero della parte H8S/2214
Spiegazioni elettronici  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  936 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S/2214 Scheda tecnica(HTML) 201 Page - Renesas Technology Corp

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Section 6 Bus Controller
Rev.4.00 Sep. 18, 2008 Page 141 of 872
REJ09B0189-0400
6.4.3
Valid Strobes
Table 6.4 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 6.4
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)
8-bit access
Byte
Read
—
RD
Valid
Invalid
space
Write
—
HWR
Hi-Z
16-bit access
Byte
Read
Even
RD
Valid
Invalid
space
Odd
Invalid
Valid
Write
Even
HWR
Valid
Hi-Z
Odd
LWR
Hi-Z
Valid
Word
Read
—
RD
Valid
Valid
Write
—
HWR, LWR Valid
Valid
Notes: Hi-Z: High impedance.
Invalid: Input state; input value is ignored.



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