參數(shù)資料
型號(hào): ST92T163N4B1L
英文描述: 8/16-BIT FULL SPEED USB MCU FOR COMPOSITE DEVICES WITH 16 ENDPOINTS. 20K ROM. 2K RAM. I 2 C. SCI. & MFT
中文描述: 16位產(chǎn)品全速USB微控制器,16終點(diǎn)復(fù)合設(shè)備。 20,000光盤。 2K的RAM。余2長(zhǎng)脊髓損傷。
文件頁(yè)數(shù): 71/230頁(yè)
文件大?。?/td> 2743K
代理商: ST92T163N4B1L
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ST92163 - ON-CHIP DIRECT MEMORY ACCESS (DMA)
4.3 DMA TRANSACTIONS
The purpose of an on-chip DMA channel is to
transfer a block of data between a peripheral and
the Register File, or Memory. Each DMA transfer
consists of three operations:
– A load from/to the peripheral data register to/
from a location of Register File (or Memory) ad-
dressed through the DMA Address Register (or
Register pair)
– A post-increment of the DMA Address Register
(or Register pair)
– A post-decrement of the DMA transaction coun-
ter, which contains the number of transactions
that have still to be performed.
If the DMA transaction is carried out between
the
peripheral and the Register File
(
Figure 32
), one
register is required to hold the DMA Address, and
one to hold the DMA transaction counter. These
two registers must be located in the Register File:
the DMA Address Register in the even address
register, and the DMA Transaction Counter in the
next register (odd address). They are pointed to by
the DMA Transaction Counter Pointer Register
(DCPR), located in the peripheral’s paged regis-
ters. In order to select a DMA transaction with the
Register File, the control bit DCPR.RM (bit 0 of
DCPR) must be set.
If the transaction is made between
the peripheral
and Memory
, a register pair (16 bits) is required
for the DMA Address and the DMA Transaction
Counter (
Figure 33
). Thus, two register pairs must
be located in the Register File.
The DMA Transaction Counter is pointed to by the
DMA Transaction Counter Pointer Register
(DCPR), the DMA Address is pointed to by the
DMA Address Pointer Register (DAPR),both
DCPR and DAPR are located in the paged regis-
ters of the peripheral.
Figure 32. DMA Between Register File and Peripheral
IDCR
IVR
DAPR
DCPR
DATA
PAGED
REGISTERS
REGISTERS
SYSTEM
DMA
COUNTER
DMA
ADDRESS
FFh
F0h
EFh
E0h
DFh
MEMORY
000000h
DATA
ALREADY
TRANSFERRED
END OF BLOCK
INTERRUPT
SERVICE ROUTINE
DMA
TABLE
D
ISR ADDRESS
000100h
VECTOR
TABLE
REGISTER FILE
PERIPHERAL
PAGED REGISTERS
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST92T163R4T1 功能描述:8位微控制器 -MCU OTP EPROM 20K USB/I2 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST92T196/JAP 制造商:STMicroelectronics 功能描述:
ST92T96N9B1/AIN 制造商:STMicroelectronics 功能描述:
ST-930 制造商:UNBRANDED 功能描述:MULTIMETER DIGITAL BARGRAPH
ST93003 功能描述:兩極晶體管 - BJT Hi Vltg FAST SWITCH PNP Pwr TRANSISTOR RoHS:否 制造商:STMicroelectronics 配置: 晶體管極性:PNP 集電極—基極電壓 VCBO: 集電極—發(fā)射極最大電壓 VCEO:- 40 V 發(fā)射極 - 基極電壓 VEBO:- 6 V 集電極—射極飽和電壓: 最大直流電集電極電流: 增益帶寬產(chǎn)品fT: 直流集電極/Base Gain hfe Min:100 A 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PowerFLAT 2 x 2