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UPD17933 Datasheet(PDF) 71 Page - NEC

Part # UPD17933
Description  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE
PDF  252 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17933 Datasheet(HTML) 71 Page - NEC

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µPD17933, 17934
9.2 Data Buffer
9.2.1 Configuration of data buffer
Figure 9-2 shows the configuration of the data buffer.
As shown in the figure, the data buffer consists of a total of 16 bits of addresses 0CH through 0FH of BANK
0 on the data memory.
The 16-bit data is configured with bit 3 of address 0CH as the MSB and bit 0 of address 0FH as the LSB.
Because the data buffer is located on the data memory, it can be manipulated by all data memory manipulation
instructions.
Figure 9-2. Configuration of Data Buffer
Column address
0
1
2
3
4
5
6
7
01
234
5
6
7
8
9
A
B
C
D
E
F
BANK0
BANK1
BANK2
BANK14
BANK15
System register
Address
Bit
Bit
Signal
Data
b3
b15
b2
b14
b1
b13
b0
b12
DBF3
0CH
b3
b11
b2
b10
b1
b9
b0
b8
DBF2
0DH
b3
b7
b2
b6
b1
b5
b0
b4
DBF1
0EH
b3
b3
b2
b2
b1
b1
b0
b0
DBF0
0FH
Data memory
Data buffer
Data buffer (DBF)
Data memory
M
S
B
L
S
B
Data
BANK3
Remark Address 5BH is not provided to
BANK4 through BANK14.



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