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參數(shù)資料
| 型號(hào)： | PIC16F77 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 40-Pin 8-Bit CMOS FLASH Microcontrollers(40腳、8位CMOS 閃速微控制器) |
| 中文描述： | 40引腳8位CMOS閃存微控制器（40腳，8位的CMOS閃速微控制器） |
| 文件頁(yè)數(shù)： | 67/170頁(yè) |
| 文件大小： | 3150K |
| 代理商： | PIC16F77 |
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2000 Microchip Technology Inc.
Advance Information
DS30325A-page 67
PIC16F7X
9.3
SSP I
2
C Operation
The SSP module in I
2
C mode, fully implements all slave
functions, except general call support, and provides
interrupts on START and STOP bits in hardware to facil-
itate firmware implementations of the master functions.
The SSP module implements the standard mode speci-
fications as well as 7-bit and 10-bit addressing.
Two pins are used for data transfer. These are the RC3/
SCK/SCL pin, which is the clock (SCL), and the RC4/
SDI/SDA pin, which is the data (SDA). The user must
configure these pins as inputs or outputs through the
TRISC<4:3> bits.
The SSP module functions are enabled by setting SSP
enable bit SSPEN (SSPCON<5>).
FIGURE 9-5:
SSP BLOCK DIAGRAM
(I
2
C MODE)
The SSP module has five registers for I
2
C operation.
These are the:
SSP Control Register (SSPCON)
SSP Status Register (SSPSTAT)
Serial Receive/Transmit Buffer (SSPBUF)
SSP Shift Register (SSPSR) - Not directly accessible
SSP Address Register (SSPADD)
The SSPCON register allows control of the I
2
C opera-
tion. Four mode selection bits (SSPCON<3:0>) allow
one of the following I
2
C modes to be selected:
I
2
C Slave mode (7-bit address)
I
2
C Slave mode (10-bit address)
I
2
C Slave mode (7-bit address), with START and
STOP bit interrupts enabled to support firmware
Master mode
I
2
C Slave mode (10-bit address), with START and
STOP bit interrupts enabled to support firmware
Master mode
I
2
C START and STOP bit interrupts enabled to
support firmware Master mode, Slave is idle
Selection of any I
2
C mode, with the SSPEN bit set,
forces the SCL and SDA pins to be open drain, pro-
vided these pins are programmed to inputs by setting
the appropriate TRISC bits. Pull-up resistors must be
provided externally to the SCL and SDA pins for proper
operation of the I
2
C module.
Additional information on SSP I
2
C operation can be
found in the PICmicro
Mid-Range MCU Family Ref-
erence Manual (DS33023A).
9.3.1
SLAVE MODE
In Slave mode, the SCL and SDA pins must be config-
ured as inputs (TRISC<4:3> set). The SSP module will
override the input state with the output data when
required (slave-transmitter).
When an address is matched, or the data transfer after
an address match is received, the hardware automati-
cally will generate the acknowledge (ACK) pulse, and
then load the SSPBUF register with the received value
currently in the SSPSR register.
There are certain conditions that will cause the SSP
module not to give this ACK pulse. They include (either
or both):
a)
The buffer full bit BF (SSPSTAT<0>) was set
before the transfer was received.
b)
The overflow bit SSPOV (SSPCON<6>) was set
before the transfer was received.
In this case, the SSPSR register value is not loaded
into the SSPBUF, but bit SSPIF (PIR1<3>) is set.
Table 9-2 shows what happens when a data transfer
byte is received, given the status of bits BF and
SSPOV. The shaded cells show the condition where
user software did not properly clear the overflow condi-
tion. Flag bit BF is cleared by reading the SSPBUF reg-
ister while bit SSPOV is cleared through software.
The SCL clock input must have a minimum high and
low for proper operation. The high and low times of the
I
2
C specification, as well as the requirements of the
SSP module, are shown in timing parameter #100 and
parameter #101.
Read
Write
SSPSR reg
Match Detect
SSPADD reg
START and
STOP bit Detect
SSPBUF reg
Internal
Data Bus
Addr Match
Set, RESET
S, P bits
(SSPSTAT reg)
RC3/SCK/SCL
RC4/
SDI/
SDA
Shift
Clock
MSb
LSb
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| PIC16F777-E/ML | 功能描述:8位微控制器 -MCU 14KB 368 RAM 22 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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| PIC16F777-E/PT | 功能描述:8位微控制器 -MCU 14kBF 368RM 36I/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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