参数资料
型号: PIC14000T-20/SS
厂商: Microchip Technology
文件页数: 105/153页
文件大小: 0K
描述: IC MCU OTP 4KX14 A/D 28SSOP
标准包装: 2,100
系列: PIC® 14
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C
外围设备: POR,温度传感器,WDT
输入/输出数: 20
程序存储器容量: 7KB(4K x 14)
程序存储器类型: OTP
RAM 容量: 192 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 6 V
数据转换器: 斜率 A/D
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
1996 Microchip Technology Inc.
Preliminary
DS40122B-page 55
PIC14000
7.5.4
SMBus
AND ACCESS.bus
CONSIDERATIONS
PIC14000 is compliant with the SMBus specication
published by Intel. Some key points to note regarding
the bus specications and how it pertains to the
PIC14000 hardware are listed below:
SMBus has xed input voltage thresholds.
PIC14000 I/O buffers have programmable levels
that can be selected to be compatible with both
SMBus threshold levels via the SMBus and
SPGND bits in the MISC register.
A mechanism to stretch the I2C clock time has
been implemented to support SMBus slave
transactions. The SMHOG bit (MISC<7>) allows
hardware to automatically force and hold the I2C
clock line low when a data byte has been
received. This prevents the SMBus master from
overowing the receive buffer in instances where
the microcontroller may be to busy servicing
higher priority tasks to respond to a I2C module
interrupt. Or, if the microcontroller is in SLEEP
mode and needs time to wake-up and respond to
the I2C interrupt.
FIGURE 7-18: SMHOG STATE MACHINE
SMHOG = 0
SMHOG
=
1
I2CIF = 1
SMHOG
=
0
SMHOG
=
0
SMHOG
=
0
SMHOG
=
0
I2CIF = 0
I2CIF = 1
I2CIF = 0
I 2CIF
= 0
I2CIF = 1
SCL = 0
SCL = 1
A
B
C
D
E/DRIVE
SCL
LOW
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