參數(shù)資料
型號(hào): COP8CCR9LVA7/NOPB
廠商: National Semiconductor
文件頁(yè)數(shù): 78/111頁(yè)
文件大小: 0K
描述: MCU 8BIT FLASH 32K MEM 68-PLCC
標(biāo)準(zhǔn)包裝: 18
系列: COP8™ 8C
核心處理器: COP8
芯體尺寸: 8-位
速度: 20MHz
連通性: Microwire/Plus(SPI),UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 59
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 16x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 68-LCC(J 形引線)
包裝: 管件
其它名稱: COP8CCR9LVA7
SNOS535I – OCTOBER 2000 – REVISED MARCH 2013
The A/D Converter is supported by three memory mapped registers: two result registers and the control
register. When the device is reset, the mode control register (ENAD) is cleared, the A/D is powered down
and the A/D result registers have unknown data.
5.14.1.1 A/D Control Register
The control register, ENAD, contains 4 bits for channel selection, 1 bit for mode selection, 1 bit for the
multiplexor output selection, 1 bit for prescaler selection, and a Busy bit. An A/D conversion is initiated by
setting the ADBSY bit in the ENAD control register. The result of the conversion is available to the user in
the A/D result registers, ADRSTH and ADRSTL, when ADBSY is cleared by the hardware on completion
of the conversion.
Table 5-18. ENAD
Bit 7
Bit 0
Channel Select
Mode
Mux/Out
Prescale
Busy
Select
ADCH3
ADCH2
ADCH1
ADCH0
ADMOD
MUX
PSC
ADBSY
5.14.1.1.1 Channel Select
This 4-bit field selects one of sixteen channels to be the VIN+. The mode selection and the mux output
determine the VIN-input. When MUX = 0, all sixteen channels are available, as shown in Table 5-19. When
MUX = 1, only fourteen channels are available, as shown in Table 5-20.
All port pins which are used, in the application, in A/D operations must be configured as high-impedance
inputs. If the ports are configured as outputs or inputs with weak pull-up there will be a conflict between
the analog signal and the digitally driven output.
Table 5-19. A/D Converter Channel Selection when the Multiplexor Output is Disabled
Mode Select
ADMOD = 0
Mux Output
Select Bits
ADMOD = 1
Single Ended
Disabled
Differential Mode
Mode
ADCH3
ADCH2
ADCH1
ADCH0
Channel No.
Channel Pairs (+,
MUX
)
0
0, 1
0
1
1, 0
0
1
0
2
2, 3
0
1
3
3, 2
0
1
0
4
4, 5
0
1
0
1
5
5, 4
0
1
0
6
6, 7
0
1
7
7, 6
0
1
0
8
8, 9
0
1
0
1
9
9, 8
0
1
0
1
0
10
10, 11
0
1
0
1
11
11, 10
0
1
0
12
12, 13
0
1
0
1
13
13, 12
0
1
0
14
14, 15
0
1
15
15, 14
0
Copyright 2000–2013, Texas Instruments Incorporated
Functional Description
69
Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9
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