H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 99

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

2.9
2.9.1
The 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)
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
Address
Rev. 3.00 Sep 15, 2006 page 65 of 988
T1
Read data
Write data
REJ09B0330-0300
Section 2 CPU