hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 161
hd64338023s
Manufacturer Part Number
hd64338023s
Description
Renesas 8-bit Single-chip Microcomputer Super Low Power Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HD64338023S.pdf
(697 pages)
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5.1
The LSI has nine modes of operation after a reset. These include eight power-down modes, in
which power dissipation is significantly reduced. Table 5.1 gives a summary of the nine operating
modes.
Table 5.1
Operating Mode
Active (high-speed) mode
Active (medium-speed) mode
Subactive mode
Sleep (high-speed) mode
Sleep (medium-speed) mode
Subsleep mode
Watch mode
Standby mode
Module standby mode
Of these nine operating modes, all but the active (high-speed) mode are power-down modes. In
this section the two active modes (high-speed and medium speed) will be referred to collectively
as active mode.
Figure 5.1 shows the transitions among these operation modes. Table 5.2 indicates the internal
states in each mode.
Overview
Operating Modes
Section 5 Power-Down Modes
Description
The CPU and all on-chip peripheral functions are operable on
the system clock in high-speed operation
The CPU and all on-chip peripheral functions are operable on
the system clock in low-speed operation
The CPU and all on-chip peripheral functions are operable on
the subclock in low-speed operation
The CPU halts. On-chip peripheral functions are operable on
the system clock
The CPU halts. On-chip peripheral functions operate at a
frequency of 1/128, 1/64, 1/32, or 1/16 of the system clock
frequency
The CPU halts. The time-base function of timer A, timer C,
timer F, timer G, SCI3, AEC, and LCD controller/driver are
operable on the subclock
The CPU halts. The time-base function of timer A, timer F,
timer G, AEC and LCD controller/driver are operable on the
subclock
The CPU and all on-chip peripheral functions halt
Individual on-chip peripheral functions specified by software
enter standby mode and halt
Rev. 7.00 Mar 10, 2005 page 119 of 652
Section 5 Power-Down Modes
REJ09B0042-0700
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