hd64338342hw Renesas Electronics Corporation., hd64338342hw Datasheet - Page 183

• Manufacturer Part Number: hd64338342hw
• Description: Renesas 8-bit Single-chip Microcomputer H8 Family/h8/300l Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

5.7
5.7.1
If the RES pin is driven low, active (medium-speed) mode is entered. If the LSON bit in SYSCR2
is set to 1 while the LSON bit in SYSCR1 is cleared to 0, a transition to active (medium-speed)
mode results from IRQ
timer G, IRQ
transition to active (medium-speed) mode does not take place if the I bit of CCR is set to 1 or the
particular interrupt is disabled in the interrupt enable register.
The CPU may operate at a 1/2 state faster timing at transition to active (medium-speed) mode.
5.7.2
Active (medium-speed) mode is cleared by a SLEEP instruction.
5.7.3
Operation in active (medium-speed) mode is clocked at the frequency designated by the MA1 and
MA0 bits in SYSCR1.
Clearing by SLEEP instruction
A transition to standby mode takes place if the SLEEP instruction is executed while the SSBY
bit in SYSCR1 is set to 1, the LSON bit in SYSCR1 is cleared to 0, and the TMA3 bit in TMA
is cleared to 0. The system goes to watch mode if the SSBY bit in SYSCR1 is set to 1 and bit
TMA3 in TMA is set to 1 when a SLEEP instruction is executed.
When both SSBY and LSON are cleared to 0 in SYSCR1 and a SLEEP instruction is executed,
sleep mode is entered. Direct transfer to active (high-speed) mode or to subactive mode is also
possible. See section 5.8, Direct Transfer, below for details.
Clearing by RES pin
When the RES pin is driven low, a transition is made to the reset state and active (medium-
speed) mode is cleared.
Active (Medium-Speed) Mode
Transition to Active (Medium-Speed) Mode
Clearing Active (Medium-Speed) Mode
Operating Frequency in Active (Medium-Speed) Mode
0
, or WKP
0
7
, IRQ
to WKP
1
, or WKP
0
interrupts in watch mode, or any interrupt in sleep mode. A
7
to WKP
0
interrupts in standby mode, timer A, timer F,
Rev. 6.00 Aug 04, 2006 page 147 of 680
Section 5 Power-Down Modes
REJ09B0145-0600