r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 224

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller (BSC)
(3)
Figures 6.12 to 6.14 show bus timings for a 16-bit, 2-state access space. When a 16-bit access
space is accessed, the upper half (D15 to D8) of the data bus is used for even addresses, and the
lower half (D7 to D0) for odd addresses. Wait states cannot be inserted.
Rev. 1.00 Sep. 19, 2008 Page 194 of 1342
REJ09B0467-0100
Figure 6.12 Bus Timing for 16-Bit, 2-State Access Space (Even Address Byte Access)
Notes: 1. n = 0 to 7
16-Bit, 2-State Access Space
2. When RDNn = 0
Write
Read
φ
Address bus
CSn
AS
RD
D15 to D8
D7 to D0
HWR
LWR
D15 to D8
D7 to D0
T
1
Bus cycle
High
High impedance
Valid
T
2
Invalid
Valid