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參數(shù)資料
| 型號： | UPD17246MC-xxx-5A4 |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 4位單片微控制器的小型通用兩用紅外遙控遞質(zhì) |
| 文件頁數(shù)： | 26/102頁 |
| 文件大小： | 461K |
| 代理商： | UPD17246MC-XXX-5A4 |
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26
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
2.4.3
General register (GR)
A general register is a register on the data memory and used for arithmetic operations and transfer of data to and
from the data memory.
(1) Configuration of general register
Figure 2-8 shows the configuration of the general registers.
A general register occupies 16 nibbles (16
×
4 bits) on a selected row address of the data memory as shown
in Figure 2-8.
The row address is selected by the general register pointer (RP) of the system register. Five bits of RP are
valid. Of these, the lower 3 bits (bits 1 to 3 of RPL) are used to set a row address, and the higher 2 bits (bits
0 and 1 of RPH) are used to set a bank. The data memory that can be used as general registers is at row
addresses 0H to 7H in BANK0 to 4.
(2) Functions of general registers
A general register enables an arithmetic operation and data transfer between the data memory and a selected
general register by a single instruction. As a general register is a part of the data memory, you can say that
the general registers enable arithmetic operations and data transfer between two locations of the data memory.
Similarly, the general registers can be accessed by a data memory manipulation instruction as they are a part
of the data memory.
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