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(3) Hardware Standby Mode: A transition to hardware standby mode is made when the
STBY
pin goes low. In
hardware standby mode, the CPU and clock halt and all MCU operations stop. The on-chip supporting modules are reset,
but as long as a specified voltage is supplied, on-chip RAM contents are retained.
2.9
Basic Timing
2.9.1
Overview
The 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 (ROM, RAM)
On-chip memory is accessed in one state. The data bus is 16 bits wide, permitting both byte and word transfer instruction.
Figure 2-14 shows the on-chip memory access cycle. Figure 2-15 shows the pin states.
Internal address bus
Internal read signal
Internal data bus
Internal write signal
Internal data bus
ø
Bus cycle
T
1
Address
Read data
Write data
Read
access
Write
access
Figure 2-14 On-Chip Memory Access Cycle
Содержание ZTAT H8S/2357F
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