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H8/3003 数据表(PDF) 168 Page - Renesas Technology Corp

部件名 H8/3003
功能描述  microcontroller (MCU)
PDF  715 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8/3003 数据表(HTML) 168 Page - Renesas Technology Corp

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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)
Software Standby Mode
SRFMD = 0
SRFMD = 1 (self-refresh mode)
Signal
CAS/
WE = 0
CAS/
WE = 1
CAS/
WE = 0
CAS/
WE = 1
HWR
High-impedance
High-impedance
High
Low
LWR
High-impedance
High-impedance
High
Low
RD
High-impedance
High-impedance
Low
High
CS3
High
High
Low
Low
RFSH
High
High
Low
Low
150



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