PIC18F4431-E/PT Microchip Technology, PIC18F4431-E/PT Datasheet - Page 135

• Manufacturer Part Number: PIC18F4431-E/PT
• Description: IC MCU FLASH 8KX16 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4431-E/PT

• Core Size: 8-Bit
• Program Memory Size: 16KB (8K x 16)
• Oscillator Type: Internal
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 9x10b
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-TQFP, 44-VQFP
• Controller Family/series: PIC18
• No. Of I/o's: 36
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 768Byte
• Cpu Speed: 40MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.0
The Timer0 module has the following features:
• Software selectable as an 8-bit or 16-bit timer/
• Readable and writable
• Dedicated 8-bit software programmable prescaler
• Clock source selectable to be external or internal
• Interrupt-on-overflow from FFh to 00h in 8-bit
• Edge select for external clock
REGISTER 11-1:
 2003 Microchip Technology Inc.
counter
mode and FFFFh to 0000h in 16-bit mode
TIMER0 MODULE
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
T0CON: TIMER0 CONTROL REGISTER
Legend:
R = Readable bit
- n = Value at POR
bit 7
TMR0ON: Timer0 On/Off Control bit
1 = Enables Timer0
0 = Stops Timer0
T016BIT: Timer0 16-bit Control bit
1 = Timer0 is configured as an 8-bit timer/counter
0 = Timer0 is configured as a 16-bit timer/counter
T0CS: Timer0 Clock Source Select bit
1 = Transition on T0CKI pin
0 = Internal instruction cycle clock (CLKO)
T0SE: Timer0 Source Edge Select bit
1 = Increment on high-to-low transition on T0CKI pin
0 = Increment on low-to-high transition on T0CKI pin
PSA: Timer0 Prescaler Assignment bit
1 = TImer0 prescaler is NOT assigned. Timer0 clock input bypasses prescaler.
0 = Timer0 prescaler is assigned. Timer0 clock input comes from prescaler output.
T0PS2:T0PS0: Timer0 Prescaler Select bits
111 =1:256 prescale value
110 =1:128 prescale value
101 =1:64 prescale value
100 =1:32 prescale value
011 =1:16 prescale value
010 =1:8 prescale value
001 =1:4 prescale value
000 =1:2 prescale value
TMR0ON
R/W-1
T016BIT
R/W-1
PIC18F2331/2431/4331/4431
Preliminary
R/W-1
W = Writable bit
T0CS
‘1’ = Bit is set
Figure 11-1 shows a simplified block diagram of the
Timer0 module in 8-bit mode and Figure 11-2 shows a
simplified block diagram of the Timer0 module in 16-bit
mode.
The T0CON register (Register 11-1) is a readable and
writable register that controls all the aspects of Timer0,
including the prescale selection.
R/W-1
T0SE
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-1
PSA
T0PS2
R/W-1
x = Bit is unknown
T0PS1
R/W-1
DS39616B-page 133
T0PS0
R/W-1
bit 0