PIC16C745 Datasheet

IC型号：
PIC16C745
PDF描述：
8-Bit CMOS Microcontrollers with USB
文件大小：
4945.69KB
PDF页数：
165页
芯片厂家：

阅览下载纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158

PIC16C745/765

11.2.2

USART ASYNCHRONOUS RECEIVER

The receiver block diagram is shown in Figure 11-4.

The data is received on the RC7/RX/DT pin and drives

the data recovery block. The data recovery block is

actually a high speed shifter operating at x16 times the

baud rate, whereas the main receive serial shifter oper-

ates at the bit rate or at F

INT

Once asynchronous mode is selected, reception is

enabled by setting bit CREN (RCSTA<4>).

The heart of the receiver is the receive (serial) shift reg-

ister (RSR). After sampling the STOP bit, the received

data in the RSR is transferred to the RCREG register (if

it is empty). If the transfer is complete, flag bit RCIF

(PIR1<5>) is set. The actual interrupt can be enabled/

disabled by setting/clearing enable bit RCIE (PIE1<5>).

Flag bit RCIF is a read only bit which is cleared by the

hardware. It is cleared when the RCREG register has

been read and is empty. The RCREG is a double buff-

ered register, i.e. it is a two deep FIFO. It is possible for

two bytes of data to be received and transferred to the

RCREG FIFO and a third byte to begin shifting to the

RSR register. On the detection of the STOP bit of the

third byte, if the RCREG register is still full, then overrun

error bit OERR (RCSTA<1>) will be set. The word in the

RSR will be lost. The RCREG register can be read

twice to retrieve the two bytes in the FIFO. Overrun bit

OERR has to be cleared in software. This is done by

resetting the receive logic (CREN is cleared and then

set). If bit OERR is set, transfers from the RSR register

to the RCREG register are inhibited, so it is essential to

clear error bit OERR if it is set. Framing error bit FERR

(RCSTA<2>) is set if a stop bit is detected as clear. Bit

FERR and the 9th receive bit are buffered the same

way as the receive data. Reading the RCREG, will load

bits RX9D and FERR with new values, therefore it is

essential for the user to read the RCSTA register before

reading RCREG register in order not to lose the old

FERR and RX9D information.

FIGURE 11-4: USART RECEIVE BLOCK DIAGRAM

OERR

CREN

SPBRG

MSb

Baud Rate Generator

RC7/RX/DT

Pin Buffer

and Control

Data

Recovery

RX9

Stop (8)

RSR Register

鈥?鈥?鈥?/div>

LSb

0 Start

FERR

SPEN

RX9D

RCREG Register

FIFO

Interrupt

RCIF

RCIE

Data Bus

FIGURE 11-5: ASYNCHRONOUS RECEPTION

RX (pin)

Rcv shift

reg

Rcv buffer reg

Read Rcv

buffer reg

RCREG

RCIF

(interrupt flag)

OERR bit

CREN

Note:

This timing diagram shows three words appearing on the RX input. The RCREG (receive buffer) is read after the third word,

causing the OERR (overrun) bit to be set.

Start

bit

bit0

bit1

bit7/8 Stop

bit

Start

bit

bit0

bit7/8

Stop

bit

Start

bit

bit7/8

Stop

bit

WORD 1

RCREG

WORD 2

RCREG

漏

1999 Microchip Technology Inc.

Advanced Information

DS41124A-page 81

prev next

PIC16C745 PDF文件相关型号

PIC16C765

PIC16C745相关型号PDF文件下载

型号

版本

描述

厂商

下载
PIC12

英文版

8-Pin FLASH-Based 8-Bit CMOS Microcontrollers

PIC12
PIC12

英文版

8-Pin, 8-Bit CMOS Microcontroller with EEPROM Data Memory

MICROCHIP ...

PIC12
PIC12

英文版

8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEP...

MICROCHIP ...

PIC12
PIC12

英文版

8-Pin, 8-Bit CMOS Microcontrollers

MICROCHIP ...

PIC12
PIC12

英文版

EPROM Memory Programming Specification

MICROCHIP ...

PIC12
PIC12

英文版

8-Pin FLASH-Based 8-Bit CMOS Microcontrollers

MICROCHIP ...

PIC12
PIC18

英文版

Microcontroller

PIC18
PIC10F

英文版

Microcontroller

PIC10F
PIC1657

英文版

Microcontroller

ETC

PIC1657
PIC16C5

英文版

EPROM-Based 8-Bit CMOS Microcontroller

PIC16C5
PIC12C50

英文版

8-Pin, 8-Bit CMOS Microcontrollers

PIC12C50
PIC12C50

英文版

8-Pin, 8-Bit CMOS Microcontrollers

MICROCHIP ...

PIC12C50
PIC12C5X

英文版

ETC

PIC12C5X
PIC12C67

英文版

EPROM Memory Programming Specification

PIC12C67
PIC12C67

英文版

EPROM Memory Programming Specification

MICROCHIP ...

PIC12C67
PIC14000

英文版

28-Pin Programmable Mixed Signal Controller

PIC14000
PIC14000

英文版

EPROM Memory Programming Specification

PIC14000
PIC1657I

英文版

Microcontroller

ETC

PIC1657I
PIC1657M

英文版

Microcontroller

ETC

PIC1657M
PIC16C52

英文版

EPROM/ROM-Based 8-Bit CMOS Microcontroller Series

PIC16C52

PIC16C745 Datasheet

PDF预览

PIC16C745 PDF文件相关型号

PIC16C745相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

PIC16C745 Datasheet

PDF预览

PIC16C745 PDF文件相关型号

PIC16C745相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

建议反馈

PDF纠错X