PIC16F946T-I/PT Microchip Technology, PIC16F946T-I/PT Datasheet - Page 86

• Manufacturer Part Number: PIC16F946T-I/PT
• Description: Microcontroller
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F946T-I/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 336 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MA160011 - DAUGHTER BOARD PICDEM LCD 16F91X
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC16F946
5.3
When no prescaler is used, the external clock input is the
same as the prescaler output. The synchronization of
T0CKI, with the internal phase clocks, is accomplished by
sampling the prescaler output on the Q2 and Q4 cycles of
the internal phase clocks. Therefore, it is necessary for
T0CKI to be high for at least 2 T
of 20 ns) and low for at least 2 T
of 20 ns). Refer to the electrical specification of the
desired device.
REGISTER 5-1:
DS41265A-page 84
Using Timer0 with an External
Clock
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
OPTION_REG – OPTION REGISTER (ADDRESS: 81h OR 181h)
bit 7
RBPU: PORTB Pull-up Enable bit
1 = PORTB pull-ups are disabled
0 = PORTB pull-ups are enabled by individual port latch values in WPUA register
INTEDG: Interrupt Edge Select bit
1 = Interrupt on rising edge of RB0/INT/SEG0 pin
0 = Interrupt on falling edge of RB0/INT/SEG0 pin
T0CS: TMR0 Clock Source Select bit
1 = Transition on RA4/C1OUT/T0CKI/SEG4 pin
0 = Internal instruction cycle clock (CLKO)
T0SE: TMR0 Source Edge Select bit
1 = Increment on high-to-low transition on RA4/C1OUT/T0CKI/SEG4 pin
0 = Increment on low-to-high transition on RA4/C1OUT/T0CKI/SEG4 pin
PSA: Prescaler Assignment bit
1 = Prescaler is assigned to the WDT
0 = Prescaler is assigned to the Timer0 module
PS<2:0>: Prescaler Rate Select bits
Legend:
R = Readable bit
- n = Value at POR
R/W-1
RBPU
Note 1: A dedicated 16-bit WDT postscaler is available for the PIC16F946. See
OSC
OSC
(and a small RC delay
(and a small RC delay
Bit Value TMR0 Rate WDT Rate
Section 16.6 “Watchdog Timer (WDT)” for more information.
000
001
010
011
100
101
110
111
INTEDG
R/W-1
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
1 : 256
R/W-1
T0CS
Preliminary
W = Writable bit
‘1’ = Bit is set
1 : 1
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
R/W-1
T0SE
(1)
R/W-1
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
PSA
R/W-1
PS2
© 2005 Microchip Technology Inc.
x = Bit is unknown
R/W-1
PS1
R/W-1
PS0
bit 0