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| 型號(hào)： | MC68HC705G4 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 1 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁(yè)數(shù)： | 22/128頁(yè) |
| 文件大?。?/td> | 290K |
| 代理商： | MC68HC705G4 |
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Page 108
MOTOROLA
Section 10: A/D CONVERTER
MC68HC05G3 (705G4) Specification Rev. 1.1
10.3.2
MULTI-CHANNEL OPERATION
A multiplexer allows the single A/D converter to select one of eight analog signals. The
eight pins of port F are input signals to the multiplexer.
10.4
A/D STATUS AND CONTROL REGISTER (ADSCR) $3B
The following paragraphs describe the function of the A/D status and control register.
Figure 10-1: A/D Status and Control Register
10.4.1
COCO - CONVERSIONS COMPLETE
This read-only status bit is set when a conversion is completed, indicating that the A/D data
register contains valid results. This bit is cleared whenever the A/D status and control
register is written and a new conversion automatically started, or whenever the A/D data
register is read. Once a conversion has been started by writing to the A/D status and control
register, conversions of the selected channel will continue every 32 cycles until the A/D
status and control register is written again. In this continuous conversion mode, the A/D
data register will be filled with new data and the COCO bit will be set every 32 cycles. Data
from the previous conversion will be overwritten regardless of the state of the COCO bit
prior to writing.
10.4.2
ADRC - RC OSCILLATOR ON
When ADRC is set, the A/D section runs on the internal RC oscillator instead of the CPU
clock. The RC oscillator requires a time, t
ADRC = 5s, to stabilize and results can be
inaccurate during this time. If the CPU clock is running below 1 MHz (using OSC, not
XOSC), the RC oscillator must be used. When ADRC is cleared, the A/D uses the CPU
clock.
When the RC oscillator is being used as the conversion clock, three limitations apply:
1. The conversion complete flag (COCO) must be used to determine when
a conversion sequence has been completed, due to the frequency
tolerance of the RC oscillator and its asynchronism with regard to the
MCU E clock.
2. The conversion process runs at the nominal 1.5 MHz rate @ 5 V but the
conversion results must be transferred to the MCU result registers
synchronously with the MCU E clock, so conversion time is limited to a
maximum of one channel per E cycle.
3. If the system clock is running faster than the RC oscillator, the RC
oscillator should be turned off, and the system clock used as the
conversion clock.
COCO
$003B
ADRC ADON
0
CH3
CH2
CH1
CH0
ADSCR
B7
B6
B5
B4
B3
B2
B1
B0
00000000
RESET:
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| MC68HC705J1ACP | 功能描述:IC MCU 4MHZ 1.2K OTP 20-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤(pán) 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
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