參數(shù)資料
型號: M34509G4FP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO24
封裝: 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24
文件頁數(shù): 52/143頁
文件大小: 1056K
代理商: M34509G4FP
Rev.1.03
2009.07.27
page 16 of 140
REJ03B0147-0103
4509 Group
(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 refer-
ence 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 speci-
fies 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 specify 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 Z, X, and Y. Register Z specifies a RAM file group, reg-
ister 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).
Note
Register Z of data pointer is undefined after system is released
from reset.
Also, registers Z, X and Y are undefined in the RAM back-up. After
system is returned from the RAM back-up, set these registers.
Fig. 7 Program counter (PC) structure
Fig. 8 Data pointer (DP) structure
Fig. 9 SD instruction execution example
p5 p4 p3 p2 p1 p0
a6 a5 a4 a3 a2 a1 a0
Program counter
PCH
Specifying page
PCL
Specifying address
p6
Z1 Z0 X3 X2 X1 X0 Y3 Y2 Y1 Y0
Data pointer (DP)
Register Z (2)
Register X (4)
Register Y (4)
Specifying
RAM digit
Specifying RAM file
Specifying RAM file group
0
01
1
Set
Specifying bit position
Port D output latch
Register Y (4)
D2
D3
D1
D0
0
相關(guān)PDF資料
PDF描述
M34513M4-XXXFP 4-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PQFP32
M34514M6-XXXFP 4-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PDSO42
M34514M8-XXXFP 4-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PDSO42
M34513E4SP 4-BIT, OTPROM, 4.2 MHz, MICROCONTROLLER, PDIP32
M34513M2-XXXFP 4-BIT, MROM, 4.2 MHz, MICROCONTROLLER, PQFP32
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M34509G4HFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34509G4H-XXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34509G4-XXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34509T2-CPE 功能描述:DEV TOOL COMPACT EMULATOR: 4508/ RoHS:否 類別:編程器,開發(fā)系統(tǒng) >> 內(nèi)電路編程器、仿真器以及調(diào)試器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 19/Jul/2010 標(biāo)準(zhǔn)包裝:1 系列:* 類型:* 適用于相關(guān)產(chǎn)品:* 所含物品:*
M34512M2 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER