r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 241

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

(4)
Figures 6.26 to 6.28 show bus timings for a 16-bit, 3-state data access space. When a 16-bit access
space is accessed, the entire address bus (D15 to D0) is used for all addresses, and the upper half
(D15 to D8) of the data bus is used for even addresses and the lower half (D7 to D0) of the data
bus is used for odd addresses. Wait states can be inserted in the data cycle.
Read
Write
16-Bit, 3-State Data Access Space
Notes: 1. n = 6, 7
Address bus
D15 to D8
D15 to D8
D7 to D0
D7 to D0
2. When RDNn = 1
Figure 6.26 Bus Timing for 16-Bit, 3-State Data Access Space
HWR
LWR
CSn
RD
AH
φ
Tma1
Address cycle
(Even Address Byte Access)
Address
Address
Address
Address
Tma2
T1
Rev. 1.00 Sep. 19, 2008 Page 211 of 1342
Data cycle
Section 6 Bus Controller (BSC)
T2
Write data
Read
data
REJ09B0467-0100
T3