參數(shù)資料
型號(hào): PIC16C54C-04I/P
廠(chǎng)商: Microchip Technology
文件頁(yè)數(shù): 80/194頁(yè)
文件大?。?/td> 0K
描述: IC MCU OTP 512X12 18DIP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 25
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 4MHz
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 12
程序存儲(chǔ)器容量: 768B(512 x 12)
程序存儲(chǔ)器類(lèi)型: OTP
RAM 容量: 25 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 18-DIP(0.300",7.62mm)
包裝: 管件
配用: 309-1059-ND - ADAPTER 18 ZIF BD W/18SO PLUGS
DVA16XP180-ND - ADAPTER DEVICE FOR MPLAB-ICE
AC164001-ND - MODULE SKT PROMATEII 18/28DIP
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PIC18F2450/4450
DS39760A-page 168
Advance Information
2006 Microchip Technology Inc.
15.3
EUSART Synchronous
Master Mode
The Synchronous Master mode is entered by setting
the CSRC bit (TXSTA<7>). In this mode, the data is
transmitted in a half-duplex manner (i.e., transmission
and reception do not occur at the same time). When
transmitting data, the reception is inhibited and vice
versa. Synchronous mode is entered by setting bit,
SYNC (TXSTA<4>). In addition, enable bit, SPEN
(RCSTA<7>), is set in order to configure the TX and RX
pins to CK (clock) and DT (data) lines, respectively.
The Master mode indicates that the processor
transmits the master clock on the CK line. Clock
polarity is selected with the SCKP bit (BAUDCON<4>).
Setting SCKP sets the Idle state on CK as high, while
clearing the bit sets the Idle state as low. This option is
provided to support Microwire devices with this module.
15.3.1
EUSART SYNCHRONOUS MASTER
TRANSMISSION
The EUSART transmitter block diagram is shown in
Figure 15-3. The heart of the transmitter is the Transmit
(Serial) Shift Register (TSR). The Shift register obtains
its data from the Read/Write Transmit Buffer register,
TXREG. The TXREG register is loaded with data in
software. The TSR register is not loaded until the last
bit has been transmitted from the previous load. As
soon as the last bit is transmitted, the TSR is loaded
with new data from the TXREG (if available).
Once the TXREG register transfers the data to the TSR
register (occurs in one TCYCLE), the TXREG register is
empty and the TXIF flag bit (PIR1<4>) is set. The
interrupt can be enabled or disabled by setting or
clearing the interrupt enable bit, TXIE (PIE1<4>). TXIF
is set regardless of the state of enable bit TXIE; it
cannot be cleared in software. It will reset only when
new data is loaded into the TXREG register.
While flag bit, TXIF, indicates the status of the TXREG
register, another bit, TRMT (TXSTA<1>), shows the
status of the TSR register. TRMT is a read-only bit which
is set when the TSR is empty. No interrupt logic is tied to
this bit so the user must poll this bit in order to determine
if the TSR register is empty. The TSR is not mapped in
data memory so it is not available to the user.
To set up a Synchronous Master Transmission:
1.
Initialize the SPBRGH:SPBRG registers for the
appropriate baud rate. Set or clear the BRG16
bit, as required, to achieve the desired baud
rate.
2.
Enable the synchronous master serial port by
setting bits SYNC, SPEN and CSRC.
3.
If interrupts are desired, set enable bit TXIE.
4.
If 9-bit transmission is desired, set bit TX9.
5.
Enable the transmission by setting bit TXEN.
6.
If 9-bit transmission is selected, the ninth bit
should be loaded in bit TX9D.
7.
Start transmission by loading data to the TXREG
register.
8.
If using interrupts, ensure that the GIE and PEIE
bits in the INTCON register (INTCON<7:6>) are
set.
FIGURE 15-11:
SYNCHRONOUS TRANSMISSION
bit 0
bit 1
bit 7
Word 1
Q1 Q2 Q3Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1Q2 Q3 Q4 Q1 Q2 Q3 Q4
Q3 Q4 Q1 Q2 Q3 Q4 Q1Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
bit 2
bit 0
bit 1
bit 7
RC7/RX/DT pin
RC6/TX/CK pin
Write to
TXREG Reg
TXIF bit
(Interrupt Flag)
TXEN bit
‘1’
Word 2
TRMT bit
Write Word 1
Write Word 2
Note:
Sync Master mode (SPBRG = 0), continuous transmission of two 8-bit words.
RC6/TX/CK pin
(SCKP = 0)
(SCKP = 1)
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