HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 206

• Manufacturer Part Number: HD6417706
• Description: Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Rev. 4.00, 03/04, page 160 of 660
Refresh function
The refresh counter can be used as an interval timer
Refresh cycles will be automatically maintained in the sleep mode even after the external
bus frequency is reduced to 1/4 of its normal operating frequency
Outputs an interrupt request signal using the compare-matching function
Outputs an interrupt request signal when the refresh counter overflows
Legend
WCR
BCR
MCR
PCR
controller
Interrupt
,
: Wait state control register
: Bus control register
: Memory control register
: PCMCIA control register
,
RD/
to
to
,
CKE
,
Figure 8.1 BSC Functional Block Diagram
controller
controller
controller
controller
Memory
Refresh
Area
Wait
RFCR
RTCNT
RTCOR
RTCSR
: Refresh count register
: Refresh timer count register
: Refresh time constant register
: Refresh timer control/status register
Comparator
RTCOR
RTCNT
RTCSR
WCR1
WCR2
BCR1
BCR2
RFCR
MCR
PCR
interface
Bus
BSC