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參數(shù)資料
| 型號： | AT43USB320A-AC |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Full-speed USB Microcontroller with an Embedded Hub |
| 中文描述： | 8-BIT, 12 MHz, RISC MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, MS-026AED, LQFP-100 |
| 文件頁數(shù)： | 37/115頁 |
| 文件大小： | 722K |
| 代理商： | AT43USB320A-AC |
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37
AT43USB320A
1443E–USB–4/04
Stack Pointer Register – SP
The Stack Pointer points to the data SRAM stack area where the Subroutine and Interrupt
Stacks are located. This Stack space in the data SRAM must be defined by the program
before any subroutine calls are executed or interrupts are enabled. The stack pointer must be
set to point above $60. The Stack Pointer is decremented by one when data is pushed onto
the Stack with the PUSH instruction, and it is decremented by two when an address is pushed
onto the Stack with subroutine calls and interrupts. The Stack Pointer is incremented by one
when data is popped from the Stack with the POP instruction and it is incremented by two
when an address is popped from the Stack with return from subroutine RET or return from
interrupt RETI.
Sleep Modes
To enter the sleep modes, the SE bit in MCUCR must be set (one) and a SLEEP instruction
must be executed. If an enabled interrupt occurs while the MCU is in a sleep mode, the MCU
awakes, executes the interrupt routine, and resumes execution from the instruction following
SLEEP. The contents of the register file, SRAM and I/O memory are unaltered. If a reset
occurs during sleep mode, the MCU wakes up and executes from the Reset vector.
Power Down Mode
When the SM bit is set (one), the SLEEP instruction forces the MCU into the Power Down
Mode. In this mode, the external oscillator is stopped, while the external interrupts and the
Watchdog (if enabled) continue operating. Only an external reset or an external level interrupt
on INT0 or INT1 can wake up the MCU.
Note that when a level triggered interrupt is used for wake-up from power down, the low level
must be held for a time longer than the reset delay time-out period t
TOUT
. Otherwise, the MCU
will fail to wake up.
Bit
15
14
13
12
11
10
9
8
$3E ($5E)
I
T
H
S
V
N
Z
C
SPH
$3D ($5D)
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0
SPL
7
6
5
4
3
2
1
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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| AT43USB321 | Full-speed USB Hub/Function Microcontroller |
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| AT43USB325E-AU | Multimedia USB Keyboard Controller with Embedded Hub |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT43USB321 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Full-speed USB Hub/Function Microcontroller |
| AT43USB324AC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:KEYBOARD CONTROLLER |
| AT43USB324YC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:KEYBOARD CONTROLLER |
| AT43USB325 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset |
| AT43USB325_05 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Multimedia USB Keyboard Controller with Embedded Hub |
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