UPD17073 NEC, UPD17073 Datasheet - Page 55

• Manufacturer Part Number: UPD17073
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
• Manufacturer: NEC

9.2 Data Buffer
9.2.1 Configuration of data buffer
Figure 9-2 shows the configuration of the data buffer.
As shown in this figure, the data buffer is configured of 16 bits of addresses 0CH-0FH of BANK0 on the data memory.
Of these 16 bits, bit 3 of address 0CH is the MSB, while bit 0 of address 0FH is the LSB.
Since the data buffer is on the data memory, it can be manipulated by all the data memory manipulation instructions.
Data memory
0
1
2
3
4
5
6
7
Data buffer
0
7
1
2
Figure 9-2. Configuration of Data Buffer
Address
Symbol
3
Data
Bit
Bit
4
5
b
M
S
B
b
15
3
b
6
Column address
b
DBF3
14
0CH
Data memory
2
b
BANK0
b
7
13
1
b
BANK1
b
12
8
0
Data buffer
b
b
(DBF)
11
3
9
b
b
DBF2
0DH
10
2
A
b
System register
b
1
9
B
b
b
Data
0
8
b
b
C
3
7
b
b
DBF1
0EH
D
2
6
b
b
1
5
E
b
b
0
4
F
b
b
3
3
PD17072,17073
b
b
DBF0
0FH
2
2
b
b
1
1
b
b
L
S
B
0
0
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