
11-4
ML63326 User's Manual
Chapter 11 External Memory Transfer Function (EXTMEM)
11.4 Setting of Secondary Port Functions
The secondary functions of the port need to be set in order to execute the external memory
transfer instruction. This setting is necessary for accessing both the voice ROM inside the
chip and the memory area external to the chip. See Chapter 10, "Ports" for details of the
registers, etc., for the settings.
Further, even if secondary functions are set for the ports P7–P4, PA, and P9, the state set
by the port control registers will be effective when the external memory transfer instruction
is not executed. Therefore, these ports will become the normal output ports or I/O ports.
In addition, the pins P8.0 and P8.1 are assigned to the read signal (
RD
) and the write signal
(
WR
) respectively from the moment when the secondary functions are set for them.
11.5 Distinction between ROM Area inside the Chip and Memory Area External to the
Chip
The distinction of whether to access the area of the ROM inside the chip or to access the
memory area external to the chip is done by setting P83 (bit 3 of P8D) and P82 (bit 2 of P8D).
Table 11-2 shows the relationship between the set values of P83 and P82 and the memory
accessed.
Table 11-2 Relationship between P83 and P82 Settings and the Memory Area
Accessed
P83
P82
Memory area accessed by the MOVXB instruction
0
1
Voice ROM area inside the chip
1
1
Memory area external to the chip
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