參數(shù)資料
型號: PIC16LF1826-I/ML
廠商: Microchip Technology
文件頁數(shù): 38/109頁
文件大小: 0K
描述: IC MCU 8BIT FLASH 28QFN
產(chǎn)品培訓模塊: 8-bit PIC® Microcontroller Portfolio
標準包裝: 61
系列: PIC® XLP™ mTouch™ 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 32MHz
連通性: I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 16
程序存儲器容量: 3.5KB(2K x 14)
程序存儲器類型: 閃存
EEPROM 大小: 256 x 8
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 12x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-VQFN 裸露焊盤
包裝: 管件
192
2570N–AVR–05/11
ATmega325/3250/645/6450
trol Unit will hold the SCL low until the slave is ready to receive more data. This may reduce the
actual data rate in two-wire mode.
21.3
Alternative USI Usage
When the USI unit is not used for serial communication, it can be set up to do alternative tasks
due to its flexible design.
21.3.1
Half-duplex Asynchronous Data Transfer
By utilizing the Shift Register in Three-wire mode, it is possible to implement a more compact
and higher performance UART than by software only.
21.3.2
4-bit Counter
The 4-bit counter can be used as a stand-alone counter with overflow interrupt. Note that if the
counter is clocked externally, both clock edges will generate an increment.
21.3.3
12-bit Timer/Counter
Combining the USI 4-bit counter and Timer/Counter0 allows them to be used as a 12-bit
counter.
21.3.4
Edge Triggered External Interrupt
By setting the counter to maximum value (F) it can function as an additional external interrupt.
The Overflow Flag and Interrupt Enable bit are then used for the external interrupt. This feature
is selected by the USICS1 bit.
21.3.5
Software Interrupt
The counter overflow interrupt can be used as a software interrupt triggered by a clock strobe.
21.4
Register Descriptions
21.4.1
USIDR – USI Data Register
The USI uses no buffering of the Serial Register, i.e., when accessing the Data Register
(USIDR) the Serial Register is accessed directly. If a serial clock occurs at the same cycle the
register is written, the register will contain the value written and no shift is performed. A (left) shift
operation is performed depending of the USICS1..0 bits setting. The shift operation can be con-
trolled by an external clock edge, by a Timer/Counter0 Compare Match, or directly by software
using the USICLK strobe bit. Note that even when no wire mode is selected (USIWM1..0 = 0)
both the external data input (DI/SDA) and the external clock input (USCK/SCL) can still be used
by the Shift Register.
The output pin in use, DO or SDA depending on the wire mode, is connected via the output latch
to the most significant bit (bit 7) of the Data Register. The output latch is open (transparent) dur-
ing the first half of a serial clock cycle when an external clock source is selected (USICS1 = 1),
and constantly open when an internal clock source is used (USICS1 = 0). The output will be
changed immediately when a new MSB written as long as the latch is open. The latch ensures
that data input is sampled and data output is changed on opposite clock edges.
Bit
7
6
5
4
3
2
1
0
MSB
LSB
USIDR
Read/Write
R/W
Initial Value
0
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