參數(shù)資料
型號(hào): UPD17242UC-XXX-5A4
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 4.5 MHz, MICROCONTROLLER, PDSO30
封裝: 0.300 INCH, PLASTIC, SSOP-30
文件頁數(shù): 10/102頁
文件大?。?/td> 953K
代理商: UPD17242UC-XXX-5A4
15
Data Sheet U15002EJ1V1DS
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
PC12
PC11
PC10
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
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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