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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 289頁

  • NEC   NEC

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CHAPTER 7
SYSTEM REGISTER (SYSREG)
7.6.2 Functions of the General Register Pointer
The general register pointer is used to specify the location of the general register in data memory. For a more
detailed explanation, refer to
CHAPTER 8 GENERAL REGISTER (GR).
The general register consists of sixteen nibbles in any single row of data memory. As shown in Figure 7-15, the
general register pointer is used to indicate which row address is being used as the general register.
Since the general register pointer effectively consists of three bits, the data memory row addresses in which the
general register can be placed are address locations 0H to 7H of BANK0. In other words, any row in data memory
can be specified as the general register.
With the general register allocated in data memory, data can be transferred to and from, and arithmetic/logical
operations can be performed on the general register and data memory.
Note that addresses 40H to 6EH are uninstalled memory locations and should therefore not be specified as
locations for the general register.
For example, when instructions such as
ADD r,m and LD r,m
are executed, instruction operand r can specify an address in the general register and m specifies an address in data
memory. In this way, operations like addition and data transfer can be performed on and between data memory
and the general register.
Figure 7-15. General Register Configuration
General register pointer
(RP)
RPH
RPL
BANK0
Column address
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
Fixed to 0
Fixed to 0
Fixed to 0
Fixed to 0
0
0
0
0
錚?/div>
錚?/div>
1
Note 1
錕?frac12;
錚?/div>
1
錚?/div>
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Note
2
0 1 2 3 4 5 6 7 8 9 A B C D E F
0
1
2
3
4
5
6
7
System register
BP
General register (16 nibbles)
Example :
General
register
with
RPH=0000B
RPL=010脳B
Area in which
general register
can be specified
Notes
1.
These bits should not be specified in the case of the
碌
PD17120 and 17121.
2.
This bit is allocated to BCD flag.
60

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