UPD77016 NEC, UPD77016 Datasheet - Page 18

• Manufacturer Part Number: UPD77016
• Description: 16 bits/ Fixed-point Digital Signal Processor
• Manufacturer: NEC

2.4 Memory
separated.
Each addressing unit consists of four data pointers, four index registers, a modulo register and addressing ALU.
Memory areas are shown below.
to DP7. After memory access, DPn (with the same subscript), can be modified by DNn value. Modulo operation
is performed with DMX for DP0 to DP3, with DMY for DP4 to DP7.
18
16 bits each). It adopts Harvard-type architecture, with instruction memory area and data memory areas
The PD77016 has one instruction memory area (64K words 32 bits) and two data memory areas (64K words
X memory area addresses are specified by DP0 to DP3, and Y memory area addresses are specified by DP4
Caution
The PD77016 has 2 sets of data addressing units, which are dedicated for addressing data memory area.
0xFFFF
0x3FFF
0x37FF
0x07FF
0x4000
0x3840
0x383F
0x3800
0x0800
0x0000
When any data is accessed or stored to system address, normal operation of the PD77016 is
not assured.
Data Memory Area (X/Y Memory)
Data RAM (2 K words)
Peripheral (64 words)
External Data Memory
(48 K words)
System
System
0xFFFF
0x3FFF
0x07FF
0x023F
0x01FF
0x00FF
0x4000
0x0800
0x0240
0x0200
0x0100
0x0000
Internal Instruction RAM (1.5 K words)
Instruction Memory Area
External Instruction Memory
Bootup ROM (256 words)
Vector (64 words)
(48 K words)
System
System
PD77016