HD6413003RVF RENESAS [Renesas Technology Corp], HD6413003RVF Datasheet - Page 179
HD6413003RVF
Manufacturer Part Number
HD6413003RVF
Description
microcontroller (MCU)
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6413003RVF.pdf
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Refresh Cycle Priority Order: When there are simultaneous bus requests, the priority order is:
For details see section 6.3.7, Bus Arbiter Operation.
Wait State Insertion: When bit AST3 is set to 1 in ASTCR, the wait state controller (WSC) can
insert wait states into bus cycles and refresh cycles. For details see section 6.3.5, Wait Modes.
Self-Refresh Mode: Some pseudo-static RAM devices have a self-refresh function. After the
SRFMD bit is set to 1 in RFSHCR, when a transition to software standby mode occurs, the
H8/3003’s CS
self-refresh function can be used. On exit from software standby mode, the RFSH output goes
high.
Table 7-8 shows the pin states in software standby mode. Figure 7-16 shows the signal output
timing.
Table 7-8 Pin States in Software Standby Mode (2) (PSRAME = 1, DRAME = 0)
Signal
CS
RD
HWR
LWR
RFSF
3
(High)
3
External bus master > refresh controller > DMA controller > CPU
output goes high and its RFSH output goes low so that the pseudo-static RAM
SRFMD = 0
High
High-impedance
High-impedance
High-impedance
High
Software Standby Mode
161
SRFMD = 1 (self-refresh mode)
High
High-impedance
High-impedance
High-impedance
Low
(Low)
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