PIC18F4420T-I/PT Microchip Technology, PIC18F4420T-I/PT Datasheet - Page 4

• Manufacturer Part Number: PIC18F4420T-I/PT
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,44PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4420T-I/PT

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 16KB (8K x 16)
• 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 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F2420/2520/4420/4520
REGISTER 18-3:
7. Module: 10-Bit Analog-to-Digital
DS80288G-page 4
bit 0
When the AD clock source is selected as 2 T
RC (when ADCS2:ADCS0 = 000 or x11), in
extremely rare cases, the E
Error) and E
exceed the data sheet specification at codes 511
and 512 only.
Work around
Select the AD clock source as 4 T
16 T
2 T
Date Codes that pertain to this issue:
All engineering and production devices.
OSC
OSC
or RC.
, 32 T
Converter
ABDEN: Auto-Baud Detect Enable bit
Asynchronous mode:
1 = Enable baud rate measurement on the next character. Requires reception of a Sync field (55h);
0 = Baud rate measurement disabled or completed
Synchronous mode:
Unused in this mode.
DL
OSC
(Differential Linearity Error) may
cleared in hardware upon completion.
BAUDCON: BAUD RATE CONTROL REGISTER (CONTINUED)
or 64 T
OSC
IL
and avoid selecting
(Integral Linearity
OSC
, 8 T
OSC
OSC
or
,
8. Module: MSSP (SPI Mode)
FIGURE 1:
EXAMPLE 2:
LOOP BTFSS SSPSTAT, BF
When the SPI is using Timer2/2 as the clock
source, a shorter than expected SCK pulse may
occur on the first bit of the transmitted/received
data (Figure 1).
Work around
To avoid producing the short pulse, turn off Timer2
and clear the TMR2 register, load the SSPBUF
with the data to transmit and then turn Timer2 back
on. Refer to Example 2 for sample code.
Date Codes that pertain to this issue:
All engineering and production devices.
SDO
SCK
BRA
MOVF
MOVWF RXDATA
MOVF
BCF
CLRF
MOVWF SSPBUF
BSF
Write SSPBUF
LOOP
SSPBUF, W
TXDATA, W
T2CON, TMR2ON
TMR2
T2CON, TMR2ON
bit 0 = 1 bit 1 = 0
SCK PULSE VARIATION
USING TIMER2/2
AVOIDING THE INITIAL
SHORT SCK PULSE
© 2007 Microchip Technology Inc.
;Data received?
;(Xmit complete?)
;No
;W = SSPBUF
;Save in user RAM
;W = TXDATA
;Timer2 off
;Clear Timer2
;Xmit New data
;Timer2 on
bit 2 = 1 . . . .