UPD17073 NEC, UPD17073 Datasheet - Page 21
UPD17073
Manufacturer Part Number
UPD17073
Description
4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
Manufacturer
NEC
Datasheet
1.UPD17073.pdf
(226 pages)
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2.2 Program Memory
be stored in one address of the program memory.
instruction.
2.3 Program Counter
page.
Caution With the PD17072, the range of addresses that can be called by each instruction is 0000H to
Figure 2-2 shows the configuration of the program memory.
As shown in this figure, the program memory is configured as follows:
Therefore, the addresses of the program memory range from 0000H to 0FFFH.
All the “instructions” are “one-word instructions” each of which is 16 bits long. Consequently, one instruction can
As constant data, the contents of the program memory are read to the data buffer by using a table reference
Figure 2-3 shows the configuration of the program counter.
The program counter specifies an address of the program memory.
As shown in this figure, the program counter is a 12-bit binary counter. The most significant bit b
0
0
0
0
0
0
0
B
0
0
0
0
7
F
F
F
F
0
0
0
0
F
F
F
0
1
2
3
H
H
H
H
H
H
H
PC
Page
PD17072: 3072
PD17073: 4096
0BFFH. The area from addresses 0C00H through 0FFFH is an undefined area.
11
PC
Serial interface interrupt vector
Basic timer 1 interrupt vector
10
INT pin interrupt vector
Reset start address
(with PD17073)
(with PD17072)
PC
9
16 bits
16 bits (0000H-0BFFH)
16 bits (0000H-0FFFH)
Figure 2-3. Configuration of Program Counter
Figure 2-2. Configuration of Program Memory
PC
8
PC
7
PC
PC
6
Page 0
Page 1
PC
5
PC
4
CALL addr
instruction
subroutine
entry address
PC
3
PC
2
PD17072,17073
BR addr
instruction
branch address
BR @AR
instruction
branch address
CALL @AR
instruction
subroutine entry
address
MOVT DBF @AR
instruction table
reference address
PC
1
11
PC
indicates a
0
21
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