PIC17C44-16/P Microchip Technology, PIC17C44-16/P Datasheet - Page 55

• Manufacturer Part Number: PIC17C44-16/P
• Description: IC MCU OTP 8KX16 PWM 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 17Cr

Specifications of PIC17C44-16/P

• Core Size: 8-Bit
• Program Memory Size: 16KB (8K x 16)
• Core Processor: PIC
• Speed: 16MHz
• Connectivity: UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Type: OTP
• Ram Size: 454 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 6 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Controller Family/series: PIC17
• No. Of I/o's: 33
• Ram Memory Size: 454Byte
• Cpu Speed: 16MHz
• No. Of Timers: 4
• No. Of Pwm Channels: 2
• Package: 40PDIP
• Device Core: PIC
• Family Name: PIC17
• Maximum Speed: 16 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 33
• Interface Type: SCI/USART
• Number Of Timers: 4
• Embedded Interface Type: USART
• Rohs Compliant: Yes
• Processor Series: PIC17C
• Core: PIC
• Data Ram Size: 454 B
• Maximum Clock Frequency: 16 MHz
• Maximum Operating Temperature: + 70 C
• Mounting Style: Through Hole
• Development Tools By Supplier: ICE2000
• Minimum Operating Temperature: 0 C
• Data Rom Size: 454 B
• Height: 4.95 mm
• Length: 53.21 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Width: 14.73 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DVA17XP401 - DEVICE ADAPTER FOR PIC17C42AAC174001 - MODULE SKT PROMATEII 40DIP
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

9.2
PORTB is an 8-bit wide bi-directional port. The corre-
sponding data direction register is DDRB. A '1' in DDRB
configures the corresponding port pin as an input. A '0'
in the DDRB register configures the corresponding port
pin as an output. Reading PORTB reads the status of
the pins, whereas writing to it will write to the port latch.
Each of the PORTB pins has a weak internal pull-up. A
single control bit can turn on all the pull-ups. This is
done by clearing the RBPU (PORTA<7>) bit. The weak
pull-up is automatically turned off when the port pin is
configured as an output. The pull-ups are enabled on
any reset.
PORTB also has an interrupt on change feature. Only
pins configured as inputs can cause this interrupt to
occur (i.e. any RB7:RB0 pin configured as an output is
excluded from the interrupt on change comparison).
The input pins (of RB7:RB0) are compared with the
value in the PORTB data latch. The “mismatch” outputs
of RB7:RB0 are OR’ed together to generate the
PORTB Interrupt Flag RBIF (PIR<7>).
FIGURE 9-4:
1996 Microchip Technology Inc.
Note: I/O pins have protection diodes to V
Weak
Pull-Up
PORTB and DDRB Registers
BLOCK DIAGRAM OF RB<7:4> AND RB<1:0> PORT PINS
OE
DD
and V
SS
Port
Input Latch
.
Port
Data
Q
This interrupt can wake the device from SLEEP. The
user, in the interrupt service routine, can clear the inter-
rupt by:
a)
b)
A mismatch condition will continue to set the RBIF bit.
Reading then writing PORTB will end the mismatch
condition, and allow the RBIF bit to be cleared.
This interrupt on mismatch feature, together with soft-
ware configurable pull-ups on this port, allows easy
interface to a key pad and make it possible for wake-up
on key-depression. For an example, refer to AN552 in
the Embedded Control Handbook .
The interrupt on change feature is recommended for
wake-up on operations where PORTB is only used for
the interrupt on change feature and key depression
operation.
CK
Read-Write PORTB (such as; MOVPF PORTB,
PORTB ). This will end mismatch condition.
Then, clear the RBIF bit.
D
Match Signal
from other
port pins
Q
CK
PIC17C4X
D
Peripheral Data in
RBPU
DS30412C-page 55
WR_PORTB (Q4)
RD_PORTB (Q2)
WR_DDRB (Q4)
RD_DDRB (Q2)
(PORTA<7>)
Data Bus
RBIF