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參數(shù)資料
| 型號： | AT91SAM9XE512-QU |
| 廠商： | Atmel |
| 文件頁數(shù)： | 85/159頁 |
| 文件大?。?/td> | 0K |
| 描述： | MCU ARM9 512K FLASH 208-PQFP |
| 產(chǎn)品培訓(xùn)模塊： | MCU Product Line Introduction |
| 標(biāo)準(zhǔn)包裝： | 24 |
| 系列： | SAM9XE |
| 核心處理器： | ARM9 |
| 芯體尺寸： | 16/32-位 |
| 速度： | 180MHz |
| 連通性： | EBI/EMI，以太網(wǎng)，I²C，MMC，SPI，SSC，UART/USART，USB |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 96 |
| 程序存儲器容量： | 512KB（512K x 8） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 56K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.65 V ~ 1.95 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 4x10b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 208-MQFP，208-PQFP |
| 包裝： | 托盤 |
| 配用： | AT91SAM9XE-EK-ND - KIT EVAL FOR AT91SAM9XE AT91SAM-ICE-ND - EMULATOR FOR AT91 ARM7/ARM9 |
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2007 Microchip Technology Inc.
DS41213D-page 19
PIC16F5X
3.5
Program Counter
As a program instruction is executed, the Program
Counter (PC) will contain the address of the next
program instruction to be executed. The PC value is
increased by one, every instruction cycle, unless an
instruction changes the PC.
For a GOTO instruction, bits 8:0 of the PC are provided
by the GOTO instruction word. The PC Latch (PCL) is
mapped to PC<7:0> (Figure 3-6 and Figure 3-7).
For the PIC16F57 and PIC16F59, a page number must
be supplied as well. Bit 5 and bit 6 of the STATUS reg-
ister provide page information to bit 9 and bit 10 of the
PC (Figure 3-6 and Figure 3-7).
For a CALL instruction, or any instruction where the
PCL is the destination, bits 7:0 of the PC again are
provided by the instruction word. However, PC<8>
does not come from the instruction word, but is always
cleared (Figure 3-6 and Figure 3-7).
Instructions where the PCL is the destination or modify
PCL instructions, include MOVWF PCL, ADDWF PCL,
and BSF PCL,5.
For the PIC16F57 and PIC16F59, a page number
again must be supplied. Bit 5 and bit 6 of the STATUS
register provide page information to bit 9 and bit 10 of
the PC (Figure 3-6 and Figure 3-7).
FIGURE 3-6:
LOADING OF PC BRANCH
INSTRUCTIONS – PIC16F54
FIGURE 3-7:
LOADING OF PC BRANCH
INSTRUCTIONS – PIC16F57
AND PIC16F59
3.5.1
PAGING CONSIDERATIONS
PIC16F57 AND PIC16F59
If the PC is pointing to the last address of a selected
memory page, when it increments, it will cause the pro-
gram to continue in the next higher page. However, the
page preselect bits in the STATUS register will not be
updated. Therefore, the next GOTO, CALL or MODIFY
PCL
instruction will send the program to the page
specified by the page preselect bits (PA0 or PA<1:0>).
For example, a NOP at location 1FFh (page 0)
increments the PC to 200h (page 1). A GOTO xxx at
200h will return the program to address xxh on page 0
(assuming that PA<1:0> are clear).
To prevent this, the page preselect bits must be
updated under program control.
3.5.2
EFFECTS OF RESET
The PC is set upon a Reset, which means that the PC
addresses the last location in the last page (i.e., the
Reset vector).
The STATUS register page preselect bits are cleared
upon a Reset, which means that page 0 is preselected.
Therefore, upon a Reset, a
GOTO
instruction at the
Reset vector location will automatically cause the
program to jump to page 0.
Note:
Because PC<8> is cleared in the CALL
instruction or any modified PCL instruc-
tion, all subroutine calls or computed
jumps are limited to the first 256 locations
of any program memory page (512 words
long).
PC
87
0
PCL
PC
87
0
PCL
Reset to '0'
Instruction Word
GOTO
Instruction
CALL
or Modify PCL Instruction
PA<1:0>
2
Status
PC
87
0
PCL
9
10
PA<1:0>
2
Status
PC
87
0
PCL
9
10
Instruction Word
Reset to ‘0’
Instruction Word
70
GOTO
Instruction
CALL
or Modify PCL Instruction
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| AT91SAM9XE-EK | 功能描述:開發(fā)板和工具包 - ARM Eval Kit for SAM9XE Series RoHS:否 制造商:Arduino 產(chǎn)品:Development Boards 工具用于評估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口類型:DAC, ICSP, JTAG, UART, USB 工作電源電壓:3.3 V |
| AT91SAM-ICE | 功能描述:仿真器/模擬器 JTAG emulator AT91 ARM7/ARM9 RoHS:否 制造商:Blackhawk 產(chǎn)品:System Trace Emulators 工具用于評估:C6000, C5000, C2000, OMAP, DAVINCI, SITARA, TMS470, TMS570, ARM 7/9, ARM Cortex A8/R4/M3 用于:XDS560v2 |
| AT91SAMS64-AI | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:AT91 ARM㈢ Thumb㈢-based Microcontrollers |
| AT91SC192192CT-USB | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:32-bit Secure Microcontrollers |
| AT91SC25672RC | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:32-bit Secure Microcontroller for Smart Cards |
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