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參數(shù)資料
| 型號： | PIC16C923 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8-Bit CMOS Microcontroller with LCD Driver(每個(gè)I/O口有25mA驅(qū)動/吸收電流，1路捕捉/比較/PWM的微控制器) |
| 中文描述： | 8位CMOS微控制器與LCD驅(qū)動器（每個(gè)的I / O口有25毫安驅(qū)動/吸收電流，1路捕捉/比較/脈寬調(diào)制的微控制器） |
| 文件頁數(shù)： | 65/189頁 |
| 文件大?。?/td> | 1544K |
| 代理商： | PIC16C923 |
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1997 Microchip Technology Inc.
DS30444E - page 65
PIC16C9XX
11.1
The SPI mode allows 8-bits of data to be synchro-
nously transmitted and received simultaneously. To
accomplish communication, typically three pins are
used:
Serial Data Out (SDO) RC5/SDO
Serial Data In (SDI) RC4/SDI
Serial Clock (SCK) RC3/SCK
Additionally a fourth pin may be used when in a slave
mode of operation:
Slave Select (SS) RA5/AN4/SS (the AN4 function
is implemented on the PIC16C924 only)
When initializing the SPI, several options need to be
specified. This is done by programming the appropriate
control bits in the SSPCON register (SSPCON<5:0>)
and SSPSTAT<7:6>. These control bits allow the fol-
lowing to be specified:
Master Mode (SCK is the clock output)
Slave Mode (SCK is the clock input)
Clock Polarity (Idle state of SCK)
Clock edge (output data on rising/falling edge of
SCK)
Clock Rate (Master mode only)
Slave Select Mode (Slave mode only)
The SSP consists of a transmit/receive Shift Register
(SSPSR) and a buffer register (SSPBUF). The SSPSR
shifts the data in and out of the device, MSb first. The
SSPBUF holds the data that was written to the SSPSR,
until the received data is ready. Once the 8-bits of data
have been received, that byte is moved to the SSPBUF
register. Then the buffer full detect bit BF
(SSPSTAT<0>) and interrupt flag bit SSPIF (PIR1<3>)
are set. This double buffering of the received data
(SSPBUF) allows the next byte to start reception before
reading the data that was just received. Any write to the
SSPBUF register during transmission/reception of data
will be ignored, and the write collision detect bit WCOL
(SSPCON<7>) will be set. User software must clear the
WCOL bit so that it can be determined if the following
write(s) to the SSPBUF register completed success-
fully. When the application software is expecting to
receive valid data, the SSPBUF should be read before
the next byte of data to transfer is written to the
SSPBUF. Buffer full bit BF (SSPSTAT<0>) indicates
when SSPBUF has been loaded with the received data
(transmission is complete). When the SSPBUF is read,
bit BF is cleared. This data may be irrelevant if the SPI
is only a transmitter. Generally the SSP Interrupt is
used to determine when the transmission/reception
has completed. The SSPBUF must be read and/or writ-
ten. If the interrupt method is not going to be used, then
software polling can be done to ensure that a write col-
lision does not occur. Example 11-1 shows the loading
of the SSPBUF (SSPSR) for data transmission. The
shaded instruction is only required if the received data
is meaningful.
SPI Mode
EXAMPLE 11-1: LOADING THE SSPBUF
(SSPSR) REGISTER
BCF STATUS, RP1 ;Select Bank1
BSF STATUS, RP0 ;
LOOP BTFSS SSPSTAT, BF ;Has data been
;received
;(transmit
;complete)
GOTO LOOP ;No
BCF STATUS, RP0 ;Select Bank0
MOVF SSPBUF, W ;W reg = contents
; of SSPBUF
MOVWF RXDATA ;Save in user RAM
MOVF TXDATA, W ;W reg = contents
; of TXDATA
MOVWF SSPBUF ;New data to xmit
The block diagram of the SSP module, when in SPI
mode (Figure 11-3), shows that the SSPSR is not
directly readable or writable, and can only be accessed
from addressing the SSPBUF register. Additionally, the
SSP status register (SSPSTAT) indicates the various
status conditions.
FIGURE 11-3: SSP BLOCK DIAGRAM
(SPI MODE)
Read
Write
Internal
data bus
RC4/SDI/SDA
RC5/SDO
RA5/AN4/SS
RC3/SCK/
SCL
SSPSR reg
SSPBUF reg
SSPM3:SSPM0
bit0
shift
clock
SS Control
Enable
Edge
Select
Clock Select
TMR2 output
2
T
CY
Prescaler
4, 16, 64
TRISC<3>
Edge
Select
2
4
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| PIC16C923-04/L | 功能描述:8位微控制器 -MCU 7KB 176 RAM 52 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 |
| PIC16C923-04/L | 制造商:Microchip Technology Inc 功能描述:8BIT CMOS MCU SMD 16C923 PLCC68 |
| PIC16C923-04/PT | 功能描述:8位微控制器 -MCU 7KB 176 RAM 52 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 |
| PIC16C923-04/SP | 制造商:Microchip Technology Inc 功能描述: |
| PIC16C923-04I/L | 功能描述:8位微控制器 -MCU 7KB 176 RAM 52 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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