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UPD17708 Datasheet(PDF) 50 Page - NEC

No. de pieza UPD17708
Descripción Electrónicos  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD17708 Datasheet(HTML) 50 Page - NEC

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5.6 Index Register (IX) and Data Memory Row Address Pointer (MP: memory pointer)
5.6.1 Configuration of index register and data memory row address pointer
Figure 5-6 shows the configuration of the index register and data memory row address pointer.
As shown in the figure, the index register consists of an index register (IX) made up of 11 bits (the low-order
3 bits (IXH) of system register address 7AH, and 7BH and 7CH (IXM, IXL)) and an index enable flag (IXE) at
the lowest bit position of 7FH (PSW).
The data memory row address pointer (memory pointer) consists of a data memory row address pointer (MP)
that is made up of 7 bits of the low-order 3 bits of 7AH (MPH) and 7BH (MPL), and a data memory row address
pointer enable flag (memory pointer enable flag: MPE) at the lowest bit position of 7AH (MPH).
In other words, the high-order 7 bits of the index register are shared with the data memory row address pointer
Figure 5-6. Configuration of Index Register and Data Memory Row Address Pointer
Address
Name
Symbol
Bit
Data
Clock stop
7AH
IXH
MPH
0
0
0
Retained
7BH
Index register (IX)
IXM
MPL
0
0
0
Retained
7CH
IXL
0
0
0
Retained
7EH
7FH
PSW
Memory pointer (MP)
b3
M
P
E
b2
M
S
B
M
S
B
b1
b0
b3
b2
b1
b0
L
S
B
b3
b2
b1
b0
L
S
B
b3
b2
b1
b0
b3
b2
b1
b0
I
X
E
0
0
0
R
Power-ON reset
WDT&SP reset
CE reset
IX
Program status word
(PSWORD)
MP
R: retained



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