p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 155

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

(2)
Figure 6.6 shows the bus timing for an 8-bit, 3-state access space. When an 8-bit access space is
accessed, the upper half (D15 to D8) of the data bus is used. Wait states can be inserted. This LSI
does not have the lower data bus (D7 to D0) and LWR pin. The pins for the upper data bus (D15
to D8) in this LSI are D7 to D0 and the pin for the HWR signal is WR.
8-Bit, 3-State Access Space
Read
Write
AS/IOS (IOSE = 0)
AS/IOS (IOSE = 1)
Address bus
Figure 6.6 Bus Timing for 8-Bit, 3-State Access Space
D15 to D8
D15 to D8
D7 to D0
HWR
φ
RD
T
1
Bus cycle
T
2
Valid
Rev. 1.00 Sep. 21, 2006 Page 117 of 658
Section 6 Bus Controller (BSC)
T
3
Invalid
Valid
REJ09B0310-0100