hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 99

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

Three-state access to on-chip peripheral modules
2.7
2.7.1
There are four CPU states: the reset state, program execution state, program halt state, and
exception-handling state. The program execution state includes active (high-speed or medium-
speed) mode and subactive mode. In the program halt state there are a sleep (high-speed or
medium-speed) mode, standby mode, watch mode, and sub-sleep mode. These states are shown in
figure 2.14. Figure 2.15 shows the state transitions.
φ or φ
Internal
address bus
Internal
read signal
Internal
data bus
(read access)
Internal
write signal
Internal
data bus
(write access)
SUB
CPU States
Overview
Figure 2.13 On-Chip Peripheral Module Access Cycle (3-State Access)
T
1
state
Address
Bus cycle
T
2
state
Read data
Write data
Rev. 7.00 Mar 10, 2005 page 57 of 652
T
3
state
REJ09B0042-0700
Section 2 CPU