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)： 52/152頁
文件大?。?/td> 953K
代理商： PIC14000-04
PIC14000
DS40122B-page 52
Preliminary
1996 Microchip Technology Inc.
7.5.2
MASTER MODE
Master mode operation is supported by interrupt
generation on the detection of the START and STOP.
The STOP(P) and START(S) bits are cleared from a
reset or when the I
2
C module is disabled. Control of the
I
2
C bus may be taken when the P bit is set, or the bus
is idle and both the S and P bits are cleared.
In master mode, the SCL and SDA lines are
manipulated
by
changing
TRISC<7:6> or TRISD<1:0> bits to an output (cleared).
The output level is always low, regardless of the
value(s) in PORTC<7:6> or PORTD<1:0>. So when
transmitting data, a “1” data bit must have the
TRISC<7> or TRISD<1> bit set (input) and a “0” data
bit must have the TRISC<7> or TRISD<1> bit cleared
(output). The same scenario is true for the SCL line
with the TRISC<6> or TRISD<0> bit.
The following events will cause the I
2
C interrupt Flag
(I
2
CIF) to be set (I
2
C interrupt if enabled):
START
STOP
Data transfer byte transmitted/received
Master mode of operation can be done with either the
slave mode idle (I
2
CM3...I
2
CM0 = 1011b) or with the
slave active. When both master and slave modes are
enabled, the software needs to differentiate the
source(s) of the interrupt.
the
corresponding
7.5.3
MULTI-MASTER MODE
In multi-master mode, the interrupt generation on the
detection of the START and STOP allows the
determination of when the bus is free. The STOP (P)
and START (S) bits are cleared from a reset or when
the I
2
C module is disabled. Control of the I
2
C bus may
be taken when the P bit is set, or the bus is idle and
both the S and P bits are cleared. When the bus is
busy, enabling the I
2
C interrupt will generate the
interrupt when the STOP occurs.
In multi-master operation, the SDA line must be
monitored to see if the signal level is the expected
output level. This check only needs to be done when a
high level is output. If a high level is expected and low
level is present, the device needs to release the SDA
and SCL lines (set TRISC<7:6>). There are two stages
where this arbitration can be lost, these are:
Address Transfer
Data Transfer
When the slave logic is enabled, the slave continues to
receive. If arbitration was lost during the address
transfer stage, the device may being addressed. If
addressed an ACK pulse will be generated. If
arbitration was lost during the data transfer stage, the
device will need to re-transfer the data at a later time.
TABLE 7-3:
REGISTERS ASSOCIATED WITH I
2
C OPERATION
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0B/8Bh
INTCON
GIE
PEIE
T0IE
r
r
T0IF
r
r
0Ch
PIR1
CMIF
—
—
PBIF
I
2
CIF
I
2
CIE
RCIF
ADCIF
OVFIF
8Ch
PIE1
I
2
CBUF
I
2
CADD
I
2
CCON
I
2
CSTAT
CMIE
I
2
C Serial Port Receive Buffer/Transmit Register
I
2
C mode Synchronous Serial Port (I
2
C mode) Address Register
I
2
CON
I
2
CEN
—
—
PBIE
RCIE
ADCIE
OVFIE
13h
93h
14h
WCOL
CKP
I
2
CM3
I
2
CM2
I
2
CM1
I
2
CM0
94h
—
—
D/A
P
S
R/W
UA
BF
9Eh
MISC
SMHOG
SPGNDB
SPGNDA
I
2
CSEL
SMBUS
INCLKEN
OSC2
OSC1
87h
TRISC
TRISC7
TRISC6
TRISC5
TRISC4
TRISC3
TRISC2
TRISC1
TRISC0
88h
TRISD
TRISD7
TRISD6
TRISD5
TRISD4
TRISD3
TRISD2
TRISD1
TRISD0
Legend: — = Unimplemented location, read as ‘0’
r = reserved locations, default is POR value and
should not be overwritten with any value
Note: Shaded boxes are not used by the I
2
C module.
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參數(shù)描述
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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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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