
11-7
ML63326 User's Manual
Chapter 11 External Memory Transfer Function (EXTMEM)
11
11.8 Writing to External Memory
Use the following procedure for writing data to the external memory.
(1) Set the secondary functions of the ports required for executing the external memory
transfer instruction. (P47MOD, P8MOD, P9AMOD)
(2) Set both P83DIR (bit 3 of P8DIR) and P82DIR (bit 2 of P8DIR) to "1".
(3) Set both P83 (bit 3 of P8D) and P82 (bit 2 of P8D) to "1".
(4) Set PD3DIR (bit 3 of PDDIR) to "1".
(5) Set PD3 (bit 3 of PDD) to "1".
(6) Execute the instruction -
MOVXB [RA], obj
or
MOVXB xadr16, obj
(7) When writing is finished, set PD3 (bit 3 of PDD) to "0".
The timing of writing data to the external memory is shown in Figure 11-4.
Figure 11-4 Timing of Writing Data to the External Memory
S1
S2
S1
S2
S1
S2
System clock
P7–P4
(A15–A0)
PA, P9
(D7–D0)
P8.0
(
RD
)
P8.1
(
WR
)
"H"
Port setting data
Data output
Port setting data
Address output
Port setting data
Port setting data
MOVXB [RA], obj
MOVXB xadr16, obj
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Страница 256: ...Chapter 17 17 Power Supply Circuit POWER ...
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