PIC18C242/JW Microchip Technology, PIC18C242/JW Datasheet - Page 188

• Manufacturer Part Number: PIC18C242/JW
• Description: IC MCU EPROM 8KX16 A/D 28CDIP
• Manufacturer: Microchip Technology
• Series: PIC® 18Cr

Specifications of PIC18C242/JW

• 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: 22
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: EPROM, UV
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-CDIP (0.300", 7.62mm) Window
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

PIC18CXX2
FIGURE 18-2:
18.4
If the code protection bit(s) have not been pro-
grammed, the on-chip program memory can be read
out for verification purposes.
18.5
Five memory locations (200000h - 200004h) are desig-
nated as ID locations, where the user can store check-
sum or other code identification numbers. These
locations are accessible during normal execution
through the TBLRD instruction or during program/verify.
The ID locations can be read when the device is code
protected.
DS39026C-page 186
Note 1: XT, HS or LP oscillator mode assumed.
(INTCON<1>)
(INTCON<7>)
Note:
INSTRUCTION FLOW
CLKOUT
Instruction
Instruction
INTF Flag
Executed
GIEH bit
2: GIE = ’1’ assumed. In this case, after wake- up, the processor jumps to the interrupt routine. If GIE = ’0’, execution will continue in-line.
3: T
4: CLKOUT is not available in these osc modes, but shown here for timing reference.
Fetched
INT pin
OSC1
Program Verification/Code
Protection
ID Locations
OST
(4)
PC
Microchip Technology does not recom-
mend code protecting windowed devices.
= 1024T
Inst(PC) = SLEEP
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
Inst(PC - 1)
OSC
PC
WAKE-UP FROM SLEEP THROUGH INTERRUPT
(drawing not to scale) This delay will not occur for RC and EC osc modes.
Inst(PC + 2)
SLEEP
PC+2
Processor in
SLEEP
PC+4
T
OST
(2)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Inst(PC + 4)
Inst(PC + 2)
18.6
PIC18CXXX microcontrollers can be serially pro-
grammed while in the end application circuit. This is
simply done with two lines for clock and data, and three
other lines for power, ground and the programming
voltage. This allows customers to manufacture boards
with unprogrammed devices, and then program the
microcontroller just before shipping the product. This
also allows the most recent firmware or a custom firm-
ware to be programmed.
PC+4
In-Circuit Serial Programming
Interrupt Latency
Dummy cycle
PC + 4
(1,2)
(3)
2000 Microchip Technology Inc.
Inst(0008h)
Dummy cycle
0008h
Inst(000Ah)
Inst(0008h)
000Ah