PIC18F2539T-I/SO Microchip Technology, PIC18F2539T-I/SO Datasheet - Page 20

• Manufacturer Part Number: PIC18F2539T-I/SO
• Description: IC MCU FLASH 12KX16 EE AD 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F2539T-I/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 21
• Program Memory Size: 24KB (12K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1408 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 1408 B
• Interface Type: I2C, SPI, AUSART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 21
• Number Of Timers: 16 bit
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: DV164005, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 5 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18FXX39
4.0
4.1
Data EEPROM is accessed one byte at a time via an
Address Pointer, EEADR, and a data latch, EEDATA.
Data EEPROM is read by loading EEADR with the
desired memory location and initiating a memory read
by appropriately configuring the EECON1 register. The
data will be loaded into EEDATA, where it may be
serially output on SDATA via the 4-bit command, ‘0010’
(shift out data holding register). A delay of P6 must be
introduced after the falling edge of the 8th SCLK of the
operand to allow SDATA to transition from an input to
an output. During this time, SCLK must be held low
(see Figure 4-2).
The command sequence to read a single byte of data
is shown in Table 4-1.
TABLE 4-1:
FIGURE 4-2:
DS30480C-page 20
Step 1: Direct access to Data EEPROM.
Step 2: Set the Data EEPROM Address Pointer.
Step 3: Initiate a memory read.
Step 4: Load data into the serial data holding register.
Note 1: The <LSB> is undefined; the <MSB> is the data.
4-bit Command
SCLK
SDATA
0000
0000
0000
0000
0000
0000
0000
0010
READING THE DEVICE
Read Data EEPROM Memory
1
0
2
9E A6
9C A6
0E <Addr>
6E A9
80 A6
50 A8
6E F5
<LSB><MSB>
1
READ DATA EEPROM MEMORY
3
0
SHIFT OUT DATA HOLDING REGISTER TIMING (0010)
Data Payload
4
0
P5
SDATA = Input
1
2
3
BCF EECON1, EEPGD
BCF EECON1, CFGS
MOVLW <Addr>
MOVWF EEADR
BSF EECON1, RD
MOVF EEDATA, W, 0
MOVWF TABLAT
Shift Out Data
4
5
6
Preliminary
7
8
(1)
P6
FIGURE 4-1:
9
LSb
P14
10 11
1
Core Instruction
2
SDATA = Output
12
Shift Data Out
3
13
4
No
14
5
Move to TABLAT
Shift Out Data
15 16
READ DATA EEPROM
FLOW
6
 2010 Microchip Technology Inc.
Address
Read
Done?
Byte
Start
Done
Set
MSb
P5A
Yes
Fetch Next 4-bit Command
1
n
SDATA = Input
2
n
3
n
4
n