HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 248

• Manufacturer Part Number: HD6412373R
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 6 Bus Controller (BSC)
8-Bit, 3-State Access Space: Figure 6.11 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. The
LWR pin is always fixed high. Wait states can be inserted.
16-Bit, 2-State Access Space: 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
Rev.7.00 Mar. 18, 2009 page 180 of 1136
REJ09B0109-0700
Notes: 1. n = 0 to 7
Read
Write
2. When RDNn = 0
φ
Address bus
CSn
AS
RD
D15 to D8
D7 to D0
HWR
LWR
D15 to D8
D7 to D0
Figure 6.11 Bus Timing for 8-Bit, 3-State Access Space
T
1
High impedance
Bus cycle
High
T
2
Valid
T
3
Invalid
Valid