參數(shù)資料
型號： PIC14000-04/SO
廠商： Microchip Technology
文件頁數(shù)： 128/153頁
文件大小： 0K
描述： IC MCU OTP 4KX14 A/D 28SOIC
產(chǎn)品培訓(xùn)模塊： Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標準包裝： 27
系列： PIC® 14
核心處理器： PIC
芯體尺寸： 8-位
速度： 4MHz
連通性： I²C
外圍設(shè)備： POR，溫度傳感器，WDT
輸入/輸出數(shù)： 20
程序存儲器容量： 7KB（4K x 14）
程序存儲器類型： OTP
RAM 容量： 192 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器： 斜率 A/D
振蕩器型： 內(nèi)部
工作溫度： 0°C ~ 70°C
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
包裝： 管件
配用： ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
309-1073-ND - ADAPTER 28-SOIC TO 28-SOIC
309-1024-ND - ADAPTER 28-SOIC TO 28-DIP
309-1023-ND - ADAPTER 28-SOIC TO 28-DIP
PIC14000
DS40122B-page 76
Preliminary
1996 Microchip Technology Inc.
10.2
Oscillator Congurations
The PIC14000 can be operated with two different oscil-
lator options. The user can program a conguration
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,
by
setting
INCLKEN
(MISC<2>).
Note:
The OSC2 output buffer provides less drive
than standard I/O.
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
I2CSEL
SMBUS
INCLKEN
OSC2
OSC1
Read/Write
R/W
R
POR value 00h
0
00
0
X
Bit
Name
Function
B7
SMHOG
SMHOG enable
1 = Stretch I2C CLK signal (hold low) when receive data buffer is full (refer to
Section 7.5.4). For pausing I2C transfers while preventing interruptions of A/D
conversions.
0 = Disable I2C CLK stretch.
B6
SPGNDB
Serial Port Ground Select
1 = PORTD<1:0> ground reference is the RD5/AN5 pin.
0 = PORTD<1:0> ground reference is VSS.
B5
SPGNDA
Serial Port Ground Select
1 = PORTC<7:6> ground reference is the RA1/AN1 pin.
0 = PORTC<7:6> ground reference is VSS.
B4
I2CSEL
I2C Port select Bit.
1 = PORTD<1:0> are used as the I2C clock and data lines.
0 = PORTC<7:6> are used as the I2C clock and data lines.
B3
SMBus
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.
B2
INCLKEN
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.
B1
OSC2
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.
B0
OSC1
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.
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