參數(shù)資料
型號: UPD1724x
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): 15/102頁
文件大?。?/td> 461K
代理商: UPD1724X
15
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
2.
MEMORY SPACE
2.1
Program Counter (PC)
The program counter (PC) specifies an address of the program memory (ROM).
The program counter consists of an 11/12/13-bit binary counter and a 1-bit segment register (SGR) as shown
in Figure 2-1.
Its contents are initialized to address 0000H at reset.
Figure 2-1. Configuration of Program Counter
Page
PC ( PD17240)
MSB
LSB
SGR
PC
12
PC
11
PC
10
PC
9
PC
8
PC
7
PC
6
PC
5
PC
4
PC
3
PC
2
PC
1
PC
0
PC ( PD17241)
PC ( PD17242, 17243)
PC ( PD17244, 17245, 17246)
2.1.1
Segment register (SGR)
The segment register specifies a segment of the program memory.
Table 2-1 shows the relationship between the segment register and program memory.
Table 2-1. Relationship Between Segment Register and Program Memory
Value of Segment Register
Segment of Program Memory
0
Segment 0
1
Segment 1
The segment register is set when the following instructions are executed.
BR @AR
CALL @AR
SYSCAL entry
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