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UPD17708 Datasheet(PDF) 96 Page - Renesas Technology Corp

Part # UPD17708
Description  MOS INTEGRATED CIRCUIT
PDF  358 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD17708 Datasheet(HTML) 96 Page - Renesas Technology Corp

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µPD17704, 17705, 17707, 17708, 17709
94
10.4 Operation of Data Buffer Stack
Figure 10-3 shows the operation of the data buffer stack.
As shown in the figure, when the PUT instruction is executed, the contents of the data buffer are transferred
to a data buffer stack register specified by the stack pointer, and the stack pointer is incremented by one.
When the GET instruction is executed, the contents of a data buffer stack register specified by the stack
pointer are transferred to the data buffer, and the stack pointer is decremented by one.
Therefore, note that the value of the stack pointer is set to 1 if data has been written once because its initial
value is 0, and that the stack pointer is set to 0 when data has been written four times.
Note that when writing (PUT) exceeding four levels, the first data are discarded.
Figure 10-3. Operation of Data Buffer Stack
(a) If writing does not exceed level 4
(b) If writing exceeds level 4
Undefined
Undefined
Undefined
Undefined
VDD
A
Undefined
Undefined
Undefined
PUT
A
B
Undefined
Undefined
PUT
A
B
Undefined
Undefined
GET
A
B
Undefined
Undefined
GET
0
1
2
3
A
Undefined
Undefined
Undefined
PUT
A
B
Undefined
Undefined
PUT
A
B
C
Undefined
PUT
A
B
C
D
E
B
C
D
E
B
C
D
GET
E
B
C
D
GET
PUT
PUT
0
1
2
3



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