PIC18F4423-I/ML Microchip Technology, PIC18F4423-I/ML Datasheet - Page 4

• Manufacturer Part Number: PIC18F4423-I/ML
• Description: 16KB, Flash, 768bytes-RAM, 36I/O, 8-bit Family,nanoWatt 44 QFN 8x8x0.9mm TUBE
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4423-I/ML

• 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 13x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 444-1001 - DEMO BOARD FOR PICMICRO MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC18F2423/2523/4423/4523
6. Module: MSSP (SPI Mode)
FIGURE 1:
EXAMPLE 2:
DS80289E-page 4
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
;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 . . . .
7. Module: 12-Bit Analog-to-Digital
When the AD clock source is selected as 2 T
RC (when ADCS2:ADCS0 = 000 or x11), the E
(Integral Linearity Error) and E
Linearity Error) may exceed the data sheet
specification at codes 2047, 2048 and 2049.
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
OSC
or 64 T
© 2007 Microchip Technology Inc.
OSC
and avoid selecting
DL
OSC
(Differential
, 8 T
OSC
OSC
or
IL
,