參數(shù)資料
型號(hào): PIC16F946T-I/PT
廠商: Microchip Technology
文件頁(yè)數(shù): 94/274頁(yè)
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 8KX14 64TQFP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
標(biāo)準(zhǔn)包裝: 1,200
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,LCD,POR,PWM,WDT
輸入/輸出數(shù): 53
程序存儲(chǔ)器容量: 14KB(8K x 14)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量: 336 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-TQFP
包裝: 帶卷 (TR)
配用: MA160011-ND - DAUGHTER BOARD PICDEM LCD 16F91X
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2005 Microchip Technology Inc.
Preliminary
DS41265A-page 181
PIC16F946
14.13 Master Mode
Master mode of operation is supported in firmware
using interrupt generation on the detection of the Start
and Stop conditions. The Stop (P) and Start (S) bits are
cleared from a Reset or when the SSP module is dis-
abled. The Stop (P) and Start (S) bits will toggle based
on the Start and Stop conditions. Control of the I2C bus
may be taken when the P bit is set or the bus is idle and
both the S and P bits are clear.
In Master mode, the SCL and SDA lines are manipu-
lated by clearing the corresponding TRISC<6:7> bit(s).
The output level is always low, irrespective of the
value(s) in PORTC<6:7>. So when transmitting data, a
‘1’ data bit must have the TRISC<7> bit set (input) and
a ‘0’ data bit must have the TRISC<7> bit cleared (out-
put). The same scenario is true for the SCL line with the
TRISC<6> bit. Pull-up resistors must be provided
externally to the SCL and SDA pins for proper opera-
tion of the I2C module.
The following events will cause the SSP Interrupt Flag
bit, SSPIF, to be set (SSP Interrupt will occur if
enabled):
Start condition
Stop condition
Data transfer byte transmitted/received
Master mode of operation can be done with either the
Slave mode idle (SSPM<3:0> = 1011), or with the
Slave active. When both Master and Slave modes are
enabled, the software needs to differentiate the
source(s) of the interrupt.
14.14 Multi-Master Mode
In Multi-Master mode, the interrupt generation on the
detection of the Start and Stop conditions, allows the
determination of when the bus is free. The Stop (P)
and Start (S) bits are cleared from a Reset or when the
SSP module is disabled. The Stop (P) and Start (S)
bits will toggle based on the Start and Stop conditions.
Control of the I2C bus may be taken when bit P
(SSPSTAT<4>) is set, or the bus is idle and both the S
and P bits clear. When the bus is busy, enabling the
SSP Interrupt will generate the interrupt when the Stop
condition occurs.
In Multi-Master operation, the SDA line must be moni-
tored to see if the signal level is the expected output
level. This check only needs to be done when a high
level is output. If a high level is expected and a low
level is present, the device needs to release the SDA
and SCL lines (set TRISC<6:7>). There are two
stages where this arbitration can be lost, these are:
Address Transfer
Data Transfer
When the slave logic is enabled, the slave continues
to receive. If arbitration was lost during the address
transfer stage, communication to the device may be in
progress. If addressed, an ACK pulse will be gener-
ated. If arbitration was lost during the data transfer
stage, the device will need to re-transfer the data at a
later time.
14.14.1
CLOCK SYNCHRONIZATION AND
THE CKP BIT
When the CKP bit is cleared, the SCL output is forced
to ‘0’; however, setting the CKP bit will not assert the
SCL output low until the SCL output is already sampled
low. Therefore, the CKP bit will not assert the SCL line
until an external I2C master device has already
asserted the SCL line. The SCL output will remain low
until the CKP bit is set and all other devices on the I2C
bus have deasserted SCL. This ensures that a write to
the CKP bit will not violate the minimum high time
requirement for SCL (see Figure 14-12).
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