PIC14000-20/SS Microchip Technology, PIC14000-20/SS Datasheet - Page 55

• Manufacturer Part Number: PIC14000-20/SS
• Description: IC MCU OTP 4KX14 A/D 28SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 14r

Specifications of PIC14000-20/SS

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C
• Peripherals: POR, Temp Sensor, WDT
• Number Of I /o: 20
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: OTP
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Data Converters: Slope A/D
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SSOP
• Processor Series: PIC14000
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 192 B
• Interface Type: SPI, UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 22
• Number Of Timers: 1
• Operating Supply Voltage: 2.7 V to 6 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ICE2000
• Minimum Operating Temperature: 0 C
• On-chip Adc: 14 bit
• For Use With: 309-1025 - ADAPTER 28-SSOP TO 28-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

7.5.4
PIC14000 is compliant with the SMBus specification
published by Intel. Some key points to note regarding
the bus specifications and how it pertains to the
PIC14000 hardware are listed below:
• SMBus has fixed input voltage thresholds.
FIGURE 7-18: SMHOG STATE MACHINE
1996 Microchip Technology Inc.
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.
SMBus
CONSIDERATIONS
AND ACCESS.bus
I
2
CIF = 1
SCL = 0
E/DRIVE
LOW
SCL
SCL = 1
D
Preliminary
I
I
2
2
CIF = 0
CIF = 1
A
• A mechanism to stretch the I
SMHOG = 0
been implemented to support SMBus slave
transactions. The SMHOG bit (MISC<7>) allows
hardware to automatically force and hold the I
clock line low when a data byte has been
received. This prevents the SMBus master from
overflowing the receive buffer in instances where
the microcontroller may be to busy servicing
higher priority tasks to respond to a I
interrupt. Or, if the microcontroller is in SLEEP
mode and needs time to wake-up and respond to
the I
2
C interrupt.
C
I
2
CIF = 0
B
I
2
I
2
CIF = 1
CIF = 0
PIC14000
2
C clock time has
DS40122B-page 55
2
C module
2
C