h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 129

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

2.9
2.9.1
The H8S/2600 CPU is driven by a system clock, denoted by the symbol . The period from one
rising edge of to the next is referred to as a "state." The memory cycle or bus cycle consists of
one, two, or three states. Different methods are used to access on-chip memory, on-chip
supporting modules, and the external address space.
2.9.2
On-chip memory is accessed in one state. The data bus is 16 bits wide, permitting both byte and
word transfer instruction. Figure 2-17 shows the on-chip memory access cycle. Figure 2-18 shows
the pin states.
Basic Timing
Overview
On-Chip Memory (ROM, RAM)
φ
Internal address bus
Read
access
Write
access
Internal read signal
Internal data bus
Internal write signal
Internal data bus
Figure 2-17 On-Chip Memory Access Cycle
Bus cycle
Rev. 6.00 Feb 22, 2005 page 69 of 1484
Address
T
1
Read data
Write data
REJ09B0103-0600
Section 2 CPU