h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 178

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller
6.4.3
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
Area
8-bit access
space
16-bit access
space
Notes:
Rev. 3.00 Jan 18, 2006 page 150 of 1044
REJ09B0280-0300
Undefined: Undefined data is output.
Invalid:
Port, etc.:
Valid Strobes
Data Buses Used and Valid Strobes
Access
Size
Byte
Byte
Word
Input state; input value is ignored.
Pins are used as port or on-chip supporting module input/output pins,
and not as data bus pins.
Read/
Write
Read
Write
Read
Write
Read
Write
Address
—
—
Even
Odd
Even
Odd
—
—
Valid
Strobe
RD
HWR
RD
HWR
LWR
RD
HWR, LWR
Upper Data Bus
(D15 to D8)
Valid
Valid
Invalid
Valid
Undefined
Valid
Valid
Lower Data Bus
(D7 to D0)
Port, etc.
Port, etc.
Invalid
Valid
Undefined
Valid
Valid
Valid