HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 161

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

6.5.2
Table 6.4 shows the data buses used and valid strobes for each access space.
In a read, the 5' signal is valid for both the upper and lower halves of the data bus. In a write, the
+:5 signal is valid for the upper half of the data bus, and the /:5 signal for the lower half.
Table 6.4
Note:* Undefined: Undefined data is output.
Area
8-bit
access space
16-bit
access space
Invalid: Input state with the input value ignored.
Ports or others: Used as ports or I/O pins for on-chip peripheral modules, and are not used
as the data bus.
Figure 6.4 Access Sizes and Data Alignment Control (16-bit Access Space)
Valid Strobes
Data Buses Used and Valid Strobes
Byte size
Byte size
Word size
Longword
size
Access
Size
Byte
Byte
Word
Read/
Write
Read
Write
Read
Write
Read
Write
· Even address
· Odd address
1st bus cycle
2nd bus cycle
—
—
Even
Odd
Even
Odd
—
—
Address
Valid
Strobe
5'
+:5
5'
+:5
/:5
5'
+:5, /:5
D15
Upper data bus
Upper Data Bus
(D15 to D8)
Valid
Valid
Invalid
Valid
Undefined
Valid
Valid
D8 D7
Rev. 2.0, 08/02, page 121 of 788
Lower data bus
D0
Lower Data
Bus (D7 to D0)
Ports or others
Ports or others
Invalid
Valid
Undefined
Valid
Valid
Valid