upd17072 Renesas Electronics Corporation., upd17072 Datasheet - Page 24
upd17072
Manufacturer Part Number
upd17072
Description
4-bit Single-chip Microcontroller With Hardware For Digital Tuning System
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD17072.pdf
(226 pages)
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3.3 Stack Pointer (SP)
24
Figure 3-3 shows the configuration and functions of the stack pointer.
The stack pointer is a 4-bit binary counter.
The stack pointer specifies the addresses of the address stack registers.
The value of the stack pointer can be directly read or written by using a register manipulation instruction.
reset
At
Power-ON
Clock stop
CE
Stack pointer
Name
SP
Figure 3-3. Configuration and Functions of Stack Pointer
b
0
0
3
Flag symbol
b
0
0
2
b
0
0
1
S
P
1
1
1
1
1
b
0
1
0
0
0
0
S
P
0
0
Address 0 (ASR0)
Address 1 (ASR1)
Address 2 (ASR2)
Fixed to "0"
Address
01H
Specifies address of address stack register (ASR)
Read/
Write
R/W
PD17072,17073
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