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Chapter 3
CPU Function
Preliminary User’s Manual U14913EE1V0UM00
Figure 3-10: Internal RAM Area
(3)
Internal peripheral I/O area
4 KB of memory, addresses 3FFF000H to 3FFFFFFH, is provided as an internal peripheral I/O
area.
Figure 3-11: Internal Peripheral I/O Area
Peripheral I/O registers associated with the operation mode specification and the state monitoring
for the internal peripherals I/O are all memory-mapped to the internal peripheral I/O area. Program
fetches cannot be executed from this area.
Cautions: 1. In the V850E/CA1, no registers exist which are capable of word access. But if a reg-
ister is word accessed, half word access is performed twice in the order of lower
address, then higher address of the word area, ignoring the lower 2 bits of the
address.
2. For registers in which byte access is possible, if half word access is executed, the
higher 8 bits become undefined during the read operation, and the lower 8 bits of
data are written to the register during the write operation.
3. Addresses that are not defined as registers are reserved for future expansion. If
these addresses are accessed, the operation is undefined and not guaranteed.
4. Addresses 3FFF000H to 3FFFFFFH cannot be specified as the source/destination
address of DMA transfer. Be sure to use addresses FFFF000H to FFFFFFFH for
source/destination address of DMA transfer.
Additionally to the peripheral I/O area, a 16 KB area is provided as a programmable peripheral I/O
area (refer to 3.4.9 Programmable peripheral I/O registers).
µPD703123, µPD70F3123
Internal RAM area (10 Kbytes)
3FFEFFFH
3FFE800H
3FFE7FFH
3FFC000H
3FFFFFFH
3FFF000H
Internal peripheral I/O area
(4 Kbytes)
Содержание V850E/CA1 ATOMIC
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