參數(shù)資料
型號： PIC14000-04
廠商： Microchip Technology Inc.
英文描述： 28-Pin Programmable Mixed Signal Controller
中文描述： 28引腳可編程混合信號控制器
文件頁數(shù)： 76/152頁
文件大?。?/td> 953K
代理商： PIC14000-04
PIC14000
DS40122B-page 76
Preliminary
1996 Microchip Technology Inc.
10.2
Oscillator Configurations
The PIC14000 can be operated with two different oscil-
lator options. The user can program a configuration
word (CONFIG<0>) to select one of these:
HS
High Speed Crystal/Ceramic Resonator
(CONFIG<0> =‘0’)
IN
Internal oscillator (CONFIG<0> =‘1’)
(Default)
10.2.1
INTERNAL OSCILLATOR CIRCUIT
The PIC14000 includes an internal oscillator option
that offers additional cost and board-space savings. No
external components are required. The nominal
operating frequency is 4 MHz. The frequency is mea-
sured and stored into the calibration space in EPROM.
By selecting IN mode OSC1/PBTN becomes a digital
input (with weak internal pull-up resistor) and can be
read via bit MISC<0>. Writes to this location have no
effect. The OSC1/PBTN input is capable of generating
an interrupt to the CPU if enabled (Section 10.6). Also,
the OSC2 pin becomes a digital output for general pur-
pose use and is accessed via MISC<1>. Writes to this bit
directly affect the OSC2 pin. Reading this bit returns the
contents of the output latch. The MISC register format is
shown in Figure 10-2.
The OSC2 pin can also output the IN oscillator fre-
quency,
divided-by-four,
(MISC<2>).
Note:
The OSC2 output buffer provides less drive
than standard I/O.
by
setting
INCLKEN
FIGURE 10-2: MISC REGISTER
9Eh
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
MISC
SMHOG
SPGNDB SPGNDA
I
2
CSEL
SMBUS
INCLKEN
OSC2
OSC1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
POR value 00h
0
0
0
0
0
0
0
X
Bit
Name
Function
B7
SMHOG
SMHOG enable
1 = Stretch I
Section 7.5.4). For pausing I
conversions.
0 = Disable I
C CLK stretch.
Serial Port Ground Select
1 = PORTD<1:0> ground reference is the RD5/AN5 pin.
0 = PORTD<1:0> ground reference is V
Serial Port Ground Select
1 = PORTC<7:6> ground reference is the RA1/AN1 pin.
0 = PORTC<7:6> ground reference is V
I
C Port select Bit.
1 = PORTD<1:0> are used as the I
0 = PORTC<7:6> are used as the I
SMBus-Compatibility Select
1 = SMBus compatibility mode is enabled. PORTC<7:6> and PORTD<1:0> have
SMBus-compatible input thresholds.
0 = SMBus-compatibility is disabled. PORTC<7:6> and PORTD<1:0> have Schmitt Trig-
ger input thresholds.
Oscillator Output Select (available in IN mode only).
1 = Output IN oscillator signal divided by four on OSC2 pin.
0 = Disconnect IN oscillator signal from OSC2 pin.
OSC2 output port bit (available in IN mode only).
Writes to this location affect the OSC2 pin in IN mode. Reads return the value of the
output latch.
OSC1 input port bit (available in IN mode only).
Reads from this location return the status of the OSC1 pin in IN mode. Writes have no
effect.
2
C CLK signal (hold low) when receive data buffer is full (refer to
2
C transfers while preventing interruptions of A/D
2
B6
SPGNDB
SS
.
B5
SPGNDA
SS
.
B4
I
2
CSEL
2
2
2
C clock and data lines.
C clock and data lines.
B3
SMBus
B2
INCLKEN
B1
OSC2
B0
OSC1
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PIC14000-04/SO 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC14000-04/SP 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC14000-04/SP 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 14000 SDIL28
PIC14000-04/SS 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC14000-04I/SO 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
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