hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 98

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 2 CPU
2.6.2
On-chip peripheral modules are accessed in two states or three states. The data bus width is 8 bits,
so access is by byte size only. This means that for accessing word data, two instructions must be
used. Figures 2.12 and 2.13 show the on-chip peripheral module access cycle.
Two-state access to on-chip peripheral modules
Rev. 7.00 Mar 10, 2005 page 56 of 652
REJ09B0042-0700
φ or φ
Internal address bus
Internal read signal
Internal data bus
(read access)
Internal write signal
Internal data bus
(write access)
Access to On-Chip Peripheral Modules
Figure 2.12 On-Chip Peripheral Module Access Cycle (2-State Access)
SUB
T
1
state
Bus cycle
Address
Write data
Read data
T
2
state