HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 194

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 6 Bus Controller
6.4.2
The on-chip peripheral modules are accessed in two states. The data bus is either 8 bits or 16 bits
wide, depending on the particular internal I/O register being accessed. Figure 6.6 shows the access
timing for the on-chip peripheral modules. Figure 6.7 shows the pin states.
Rev.3.00 Mar. 26, 2007 Page 152 of 772
REJ09B0355-0300
On-Chip Peripheral Module Access Timing
Figure 6.7 Pin States during On-Chip Peripheral Module Access
Internal address bus
Read
access
Write
access
Figure 6.6 On-Chip Peripheral Module Access Cycle
Address bus
AS
RD
HWR, LWR
Data bus
Internal read signal
Internal data bus
Internal write signal
Internal data bus
T
High-impedance state
1
T
1
High
High
High
Bus cycle
Unchanged
Bus cycle
Address
Write data
T
2
Read data
T
2