HD6432646 Hitachi, HD6432646 Datasheet - Page 105
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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2.9
2.9.1
The H8S/2600 CPU is driven by a system clock, denoted by the symbol ø. The period from one
rising edge of ø 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)
ø
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
T1
Read data
Write data
71
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