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H8/3003 Datasheet(PDF) 151 Page - Renesas Technology Corp

No. de pieza H8/3003
Descripción Electrónicos  microcontroller (MCU)
PDF  715 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
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H8/3003 Datasheet(HTML) 151 Page - Renesas Technology Corp

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DDR Write Timing: Data written to a data direction register (DDR) to change a CSn pin from
CSn output to generic input, or vice versa, takes effect starting from the T3 state of the DDR write
cycle. Figure 6-21 shows the timing when the CS1 pin is changed from generic input to CS1
output.
Figure 6-21 DDR Write Timing
6.4.3
BREQ Input Timing
After driving the
BREQ pin low, hold it low until BACK goes low. If BREQ returns to the high
level before
BACK goes low, the bus arbiter may operate incorrectly.
To terminate the external-bus-released state, hold the
BREQ signal high for at least three states.
If
BREQ is high for too short an interval, the bus arbiter may operate incorrectly.
ø
Address
CS1
T1
T2
T3
P8DDR address
High impedance
133



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