HD6413003RVF RENESAS [Renesas Technology Corp], HD6413003RVF Datasheet - Page 168

• Manufacturer Part Number: HD6413003RVF
• Description: microcontroller (MCU)
• Manufacturer: RENESAS [Renesas Technology Corp]

Self-Refresh Mode: Some DRAM 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 CAS and RAS
outputs go low in that order so that the DRAM self-refresh function can be used. On exit from
software standby mode, the CAS and RAS outputs both go high.
Table 7-7 shows the pin states in software standby mode. Figure 7-6 shows the signal output
timing.
Table 7-7 Pin States in Software Standby Mode (1) (PSRAME = 0, DRAME = 1)
Signal
HWR
LWR
RD
CS
RFSH
3
CAS/WE = 0
High-impedance
High-impedance
High-impedance
High
High
SRFMD = 0
CAS/WE = 1
High
High
High-impedance
High-impedance
High-impedance
Software Standby Mode
150
CAS/WE = 0
High
High
Low
Low
Low
SRFMD = 1 (self-refresh mode)
CAS/WE = 1
Low
Low
High
Low
Low