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Chapter 3
CPU Function
Preliminary User’s Manual U15839EE1V0UM00
3.5.1 Area
(1)
External ROM area
The following areas can be used as external memory area.
(a) µPD703128, µPD703129
x000 0000H to x3FF 7FFFH
Access to the external memory area uses the chip select signal assigned to each memory block
(which is carried out in the CS unit set by chip area selection control registers 0 and 1 (CSC0,
CSC1)).
Furthermore, the internal ROM, internal RAM, and internal peripheral I/O areas cannot be
accessed as external memory areas.
(b) Interrupt/exception table
The V850E/CA2 increases the interrupt response speed by assigning handler addresses
corresponding to interrupts/exceptions.
The collection of these handler addresses is called an interrupt/exception table, which is located in
the external ROM area. When an interrupt/exception request is accepted, execution jumps to the
handler address, and the program written at that memory is executed.
Table 3-5 shows the sources of interrupts/exceptions, and the corresponding addresses.
Table 3-5:
Interrupt/Exception Table (1/3)
Start Address of Interrupt/
Exception Table
Interrupt/Exception Source
0000 0000H
RESET input
0000 0010H
P60 NMI Input
0000 0020H
Watchdog timer
0000 0040H
TRAP instruction
0000 0050H
TRAP instruction
0000 0060H
Illegal opcode/DBTRAP instruction
0000 0080H
Real Time Clock Divider Tick
0000 0090H
Compare Match
0000 00A0H
Compare Match
0000 00B0H
Interval time
0000 00C0H
P61
0000 00D0H
P62
0000 00E0H
P63
0000 00F0H
P64
0000 0100H
P52
0000 0110H
P53
0000 0120H
Time base 0 Overflow
0000 0130H
Time base 1 Overflow
Note: Reserved for internal use only please leave at RESET value.
Summary of Contents for mPD703128
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