hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 179

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

5.8
5.8.1
The CPU can execute programs in three modes: active (high-speed) mode, active (medium-speed)
mode, and subactive mode. A direct transfer is a transition among these three modes without the
stopping of program execution. A direct transfer can be made by executing a SLEEP instruction
while the DTON bit in SYSCR2 is set to 1. After the mode transition, direct transfer interrupt
exception handling starts.
If the direct transfer interrupt is disabled in interrupt enable register 2 (IENR2), a transition is
made instead to sleep mode or watch mode. Note that if a direct transition is attempted while the I
bit in CCR is set to 1, sleep mode or watch mode will be entered, and it will be impossible to clear
the resulting mode by means of an interrupt.
• Direct transfer from active (high-speed) mode to active (medium-speed) mode
• Direct transfer from active (medium-speed) mode to active (high-speed) mode
• Direct transfer from active (high-speed) mode to subactive mode
• Direct transfer from subactive mode to active (high-speed) mode
When a SLEEP instruction is executed in active (high-speed) mode while the SSBY and
LSON bits in SYSCR1 are cleared to 0, the MSON bit in SYSCR2 is set to 1, and the DTON
bit in SYSCR2 is set to 1, a transition is made to active (medium-speed) mode via sleep mode.
When a SLEEP instruction is executed in active (medium-speed) mode while the SSBY and
LSON bits in SYSCR1 are cleared to 0, the MSON bit in SYSCR2 is cleared to 0, and the
DTON bit in SYSCR2 is set to 1, a transition is made to active (high-speed) mode via sleep
mode.
When a SLEEP instruction is executed in active (high-speed) mode while the SSBY and
LSON bits in SYSCR1 are set to 1, the DTON bit in SYSCR2 is set to 1, and the TMA3 bit in
TMA is set to 1, a transition is made to subactive mode via watch mode.
When a SLEEP instruction is executed in subactive mode while the SSBY bit in SYSCR1 is
set to 1, the LSON bit in SYSCR1 is cleared to 0, the MSON bit in SYSCR2 is cleared to 0,
the DTON bit in SYSCR2 is set to 1, and the TMA3 bit in TMA is set to 1, a transition is made
directly to active (high-speed) mode via watch mode after the waiting time set in SYSCR1 bits
STS2 to STS0 has elapsed.
Direct Transfer
Overview of Direct Transfer
Rev. 7.00 Mar 10, 2005 page 137 of 652
Section 5 Power-Down Modes
REJ09B0042-0700