参数资料
型号: PIC14000-20I/SS
厂商: Microchip Technology
文件页数: 108/153页
文件大小: 0K
描述: IC MCU OTP 4KX14 A/D 28SSOP
产品培训模块: Asynchronous Stimulus
标准包装: 47
系列: PIC® 14
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C
外围设备: POR,温度传感器,WDT
输入/输出数: 20
程序存储器容量: 7KB(4K x 14)
程序存储器类型: OTP
RAM 容量: 192 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 6 V
数据转换器: 斜率 A/D
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
配用: 309-1025-ND - ADAPTER 28-SSOP TO 28-DIP
PIC14000
DS40122B-page 58
Preliminary
1996 Microchip Technology Inc.
Caution:
Reading or writing the ADTMR register
during an A/D conversion cycle can pro-
duce unpredictable results and is not
recommended.
During conversion one or both of the following events
will occur:
1.
capture event
2.
timer overow
In a capture event, the comparator trips when the slope
voltage on the CDAC output exceeds the input voltage,
causing the comparator output to transition from high to
low. This causes a transfer of the current timer count to
the
capture
register
and
sets
the ADCIF
ag
(PIR1<1>).
Note:
The correct sequence for writing the
ADTMR register is HI byte followed by LO
byte. Reversing this order will prevent the
A/D timer from running.
A CPU interrupt will be generated if bit ADCIE
(PIE1<1>) is set to ‘1’ (interrupt enabled). In addition,
the Global Interrupt Enable and Peripheral Interrupt
Enables (INTCON<7,6>) must also be set. Software is
responsible for clearing the ADCIF ag prior to the next
conversion cycle. Note that this interrupt can only occur
once per conversion cycle.
In a timer overow condition, the timer rolls over from
FFFFh to 0000h, and a capture overow ag (OVFIF)
is asserted (PIR1<0>). The timer continues to incre-
ment following a timer overow. A CPU interrupt can be
generated if bit OVFIE (PIE1<0>) is set (interrupt
enabled). In addition, the Global Interrupt Enable and
Peripheral Interrupt Enables (INTCON<7,6>) must also
be set. Software is responsible for clearing the OVFIF
ag prior to the next conversion cycle.
FIGURE 8-1:
A/D BLOCK DIAGRAM
(nominal)
ADOFF
WRITE_TMR
OSC1
1
0
FOSC
(Conguration Bit)
Internal
ADTMRH
ADTMRL
Clock
Stop
Logic
Timer
(OVFIF, PIR1<0>)
ADCAPH
ADCAPL
Oscillator
Analog
Mux
Prog. Ref. A
7
6
5
4
3
2
1
0
Temp sensor
SREFLO
SREFHI
RA2/AN2
RA1/AN1
RA0/AN0
A/D Capture
A/D
Capture Interrupt
ADOFF
CDAC
~2.5uA~5uA~10uA~20uA
ADCON1<7:4>
0.1
F
ADRST (ADCON0<1>)
RA3/AN3
8
~100
ADOFF
Bandgap Ref.
Prog. Ref. B
9
~ 1 kohm
RD4/AN4
RD5/AN5
RD6/AN6
RD7/AN7
10
11
12
13
RESERVED
14
15
AMUXOE
(ADCIF, PIR1<1>)
Overow
Internal
Data
Bus
ADRST
4
Note 2
Note 1:
All current sources are disabled if ADRST = ‘1’
Note 2:
Approximately 3.5 microsecond time constant
Note 1
4-Bit Current DAC
ADCON0<7:4>
(SLPCON<0>)
(ADCON0<2>)
RA0/AN0
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