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SH7708 Datasheet(PDF) 172 Page - Renesas Technology Corp

Part # SH7708
Description  SuperH??RISC engine
PDF  633 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7708 Datasheet(HTML) 172 Page - Renesas Technology Corp

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8.7.2
Canceling Hardware Standby Mode
Hardware standby mode can only be canceled by a power-on reset.
When the CA pin is driven high while the
RESET pin is low and the BREQ pin is high, clock
oscillation is started. Hold the
RESET pin low until clock oscillation stabilizes. When the RESET
pin is driven high, the CPU begins power-on reset processing.
Hardware standby mode cannot be canceled by an interrupt or manual reset.
8.7.3
Hardware Standby Mode Timing
Figures 8.10 and 8.11 show examples of pin timing in hardware standby mode.
The CA pin is sampled using EXTAL2 (32.768 kHz), and a hardware standby request is only
recognized when the pin is low for two consecutive clock cycles.
The CA pin must be held low while the chip is in hardware standby mode.
Clock oscillation starts when the CA pin is driven high after the
RESET pin is driven low.
CKIO
CA
RESET
STATUS
Normal
Standby
Reset
0 to 10 Bcyc
Undefined
Rcyc: EXTAL2 (32.768 kHz) cycle
2 Rcyc or more
Figure 8.10 Hardware Standby Mode Timing (When CA Goes Low in Normal Operation)



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