參數(shù)資料
型號(hào): PIC14000-04I/SP
廠商: Microchip Technology
文件頁(yè)數(shù): 95/153頁(yè)
文件大?。?/td> 0K
描述: IC MCU OTP 4KX14 A/D 28DIP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 15
系列: PIC® 14
核心處理器: PIC
芯體尺寸: 8-位
速度: 4MHz
連通性: I²C
外圍設(shè)備: POR,溫度傳感器,WDT
輸入/輸出數(shù): 20
程序存儲(chǔ)器容量: 7KB(4K x 14)
程序存儲(chǔ)器類型: OTP
RAM 容量: 192 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器: 斜率 A/D
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-DIP(0.300",7.62mm)
包裝: 管件
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
ICE2000-ND - EMULATOR MPLAB-ICE 2000 POD
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PIC14000
DS40122B-page 46
Preliminary
1996 Microchip Technology Inc.
When a master does not wish to relinquish the bus (by
generating a STOP condition), a repeated START (Sr)
must be generated. This condition is identical to the
START (SDA goes high-to-low while SCL is high), but
occurs after a data transfer acknowledge pulse (not the
bus-free state). This allows a master to send
“commands” to the slave and then receive the
requested information or to address a different slave
device. This sequence is shown in Figure 7-10.
FIGURE 7-8:
MASTER - TRANSMITTER SEQUENCE
FIGURE 7-9:
MASTER - RECEIVER SEQUENCE
FIGURE 7-10: COMBINED FORMAT
For 7-bit address:
S Slave Address R/W A DATA A DATA A/A
P
"0" (write)
data transferred
(n bytes - acknowledge)
A master transmitter addresses a slave receiver with a
7-bit address. The transfer direction is not changed.
For 10-bit address:
S Slave Address
first 7 bits
R/W A1 Slave Address
second byte
A2
(write)
A master transmitter addresses a slave receiver with a
10-bit address.
From master to slave
From slave to master
A = acknowledge (SDA low)
A = not acknowledge (SDA high)
S = START condition
P = STOP condition
Data A
Data
P
A/A
For 7-bit address:
S Slave Address R/W A DATA A DATA
A
P
(read)
data transferred
(n bytes - acknowledge)
A master reads a slave immediately after the first byte.
For 10-bit address:
S Slave Address
first 7 bits
R/W A1 Slave Address
second byte
A2
(write)
A master transmitter addresses a slave receiver with a
10-bit address.
From master to slave
From slave to master
A = acknowledge (SDA low)
A = not acknowledge (SDA high)
S = START condition
P = STOP condition
Sr Slave Address
first 7 bits
R/W A3 Data A
Data
P
A
(read)
S Slave Address R/W A DATA A/A
(read or write)
(n bytes + acknowledge)
Transfer direction of data and acknowledgement bits depends on R/W bits.
Combined Format:
S Slave Address
first 7 bits
R/W A Slave Address
second byte
A
(write)
Combined format -
From master to slave
From slave to master
A = acknowledge (SDA low)
A = not acknowledge (SDA high)
S = START condition
P = STOP condition
Sr Slave Address
first 7 bits
R/W A Data A
Data
P
A
(read)
Sr Slave Address R/W A DATA A/A P
Sr = repeated
START condition
Direction of transfer
may change at this point
Data A
Data A/A
A master addresses a slave with a 10-bit address, then transmits
data to this slave and reads data from this slave.
(read)
(write)
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