YR0K42378FC000BA Renesas Electronics America, YR0K42378FC000BA Datasheet - Page 246

• Manufacturer Part Number: YR0K42378FC000BA
• Description: KIT EVAL FOR H8S/2378
• Manufacturer: Renesas Electronics America
• Series: H8®r
• Type: MCUr

Specifications of YR0K42378FC000BA

• Contents: Board
• For Use With/related Products: H8S/2378
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Section 6 Bus Controller (BSC)
6.5.2
Table 6.3 shows the data buses used and valid strobes for the access spaces.
In a read, the RD signal is valid for both the upper and the lower half 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 6.3
Area
8-bit access
space
16-bit access
space
Note: Hi-Z: High-impedance state
6.5.3
8-Bit, 2-State Access Space: Figure 6.10 shows the bus timing for an 8-bit, 2-state access space.
When an 8-bit access space is accessed, the upper half (D15 to D8) of the data bus is used. The
LWR pin is always fixed high. Wait states can be inserted.
Rev.7.00 Mar. 18, 2009 page 178 of 1136
REJ09B0109-0700
Invalid: Input state; input value is ignored.
Valid Strobes
Basic Timing
Data Buses Used and Valid Strobes
Access
Size
Byte
Byte
Word
Read/
Write
Write
Read
Write
Read
Write
Read
Address
Even
Odd
⎯
⎯
⎯
⎯
Even
Odd
Valid
Strobe
HWR
LWR
RD
HWR, LWR
RD
HWR
RD
Upper Data Bus
(D15 to D8)
Valid
Hi-Z
Valid
Valid
Valid
Valid
Invalid
Lower Data Bus
(D7 to D0)
Hi-Z
Valid
Valid
Valid
Invalid
Hi-Z
Invalid
Valid