HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 186

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

6.4.3
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
Area
Note: Hi-Z: High impedance
Rev.4.00 Sep. 07, 2007 Page 156 of 1210
REJ09B0245-0400
8-bit access
space
16-bit access
space
Invalid: Input state; input value is ignored.
Valid Strobes
Data Buses Used and Valid Strobes
Access
Size
Word
Byte
Byte
Read/
Write
Read
Write
Read
Write
Read
Write
Address
—
—
Even
Odd
Even
Odd
—
—
Valid
Strobe
LWR
RD
HWR, LWR Valid
RD
HWR
RD
HWR
Upper Data Bus
(D
Hi-Z
Valid
Valid
Valid
Invalid
Valid
15
to D
8
)
Lower Data Bus
(D
Valid
Valid
Valid
Invalid
Hi-Z
Invalid
Valid
Hi-Z
7
to D
0
)