r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 1145

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Table 24.3 Combinations of SYSCR Settings and Operation in Access to On-Chip RAM
24.2.6
When the ACSE bit in MSTPCRH is set to 1 and module stop mode is set for all the on-chip
peripheral functions controlled by MSTPCR or EXMSTPCR (MSTPCR = H'FFFF, EXMSTPCR
= H'FFFF), or for all the on-chip peripheral functions except the 8-bit timer (MSTPCR = H'FFFE,
EXMSTPCR = H'FFFF), executing a SLEEP instruction while the SSBY bit in SBYCR is cleared
to 0 will cause all the on-chip peripheral functions (except the 8-bit timer and watchdog timer), the
bus controller, and the I/O ports to stop operating, and a transition to be made to all module clocks
stop mode at the end of the bus cycle.
Operation or stopping of the 8-bit timer can be selected by means of the MSTP0 bit.
To further reduce the current consumption in all module clocks stop mode, stop the modules
controlled by RMMSTPCR (RMMSTPCR = H'FFFF).
All module clocks stop mode is cleared by an external interrupt (NMI, IRQ0 to IRQ15* pins),
RES pin input, or an internal interrupt (8-bit timer, watchdog timer), and the CPU returns to the
normal program execution state via the exception handling state. All module clocks stop mode is
not cleared if interrupts are disabled, if interrupts other than NMI are masked by the CPU, or if the
relevant interrupt is designated as a DTC activation source.
When the STBY pin is driven low, a transition is made to hardware standby mode.
Note: * IRQ8 to IRQ15 are not supported by the H8S/2424 group.
RAME
1
0
Register Settings
EXPE
X
1
0
All Module Clocks Stop Mode
mstp
1
0
X
X
Target for Access Description

On-chip RAM
External address
space

This area is not readable/writable and access is
prohibited.
This area is not readable/writable and access is
prohibited.
Rev. 1.00 Sep. 19, 2008 Page 1117 of 1270
Section 24 Power-Down Modes
REJ09B0466-0100