參數(shù)資料
型號(hào)： M34286G2-XXXGP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20
封裝： 4.40 X 6.50 MM, 0.65 MM PITCH, PLASTIC, LSSOP-20
文件頁(yè)數(shù)： 3/30頁(yè)
文件大?。?/td> 516K
代理商： M34286G2-XXXGP
Rev.1.00
Aug 06, 2008
page 9 of 64
REJ03B0251-0100
4286 Group
Fig. 7 Program counter (PC) structure
Fig. 8 Data pointer (DP) structure
Fig. 9 SD instruction execution example
(8) Program counter (PC)
Program counter (PC) is used to specify a ROM address (page
and address). It determines a sequence in which instructions
stored in ROM are read. It is a binary counter that increments
the number of instruction bytes each time an instruction is
executed. However, the value changes to a specified address
when branch instructions, subroutine call instructions, return
instructions, or the table reference instruction (TABP p) is
executed.
Program counter consists of PCH (most significant bit to bit 7)
which specifies to a ROM page and PCL (bits 6 to 0) which
specifies an address within a page. After it reaches the last
address (address 127) of a page, it specifies address 0 of the
next page (Figure 7).
Make sure that the PCH does not exceed after the last page of
the built-in ROM.
(9) Data pointer (DP)
Data pointer (DP) is used to specify a RAM address and consists
of registers X and Y. Register X specifies a file and register Y
specifies a RAM digit (Figure 8).
Register Y is also used to specify the port D bit position.
When using port D, set the port D bit position to register Y
certainly and execute the SD, RD, or SZD instruction (Figure 9).
p3 p2 p1 p0
a6 a5 a4 a3 a2 a1 a0
Program counter (PC)
PCH
Specifying
page
PCL
Specifying address
0
1
01
D5
D7
D0
1
Specifying bit position
Set
Register Y (4)
Port D output latch
X1 X0 Y3 Y2 Y1 Y0
Data pointer (DP)
Register X (2)
Register Y (4)
Specifying
RAM digit
Specifying RAM file
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