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- Integrated Circuits (ICs)/
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PIC16C74-04/L
PIC16C74-04/L | |
|---|---|
| Manufacturer Part Number | PIC16C74-04/L |
| Description | MICRO CTRL 4K 4MHZ OTP 44PLCC |
| Manufacturer | Microchip Technology |
| Series | PIC® 16C |
| PIC16C74-04/L datasheets |
|
Availability: By request
International delivery:
Warranty: 60 days
×
- We provide standard 60-days warranty for all parts. If warranty differs we always mention it beforehand. In case of return we cover shipping costs.
- If you still have any questions - please contact us
×
Shipping terms
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- For new client payment term is payment in advance. At this moment we accept 3 payment methods: wire transfer, PayPal and Western Union. Credit card payment is under constrution and will be introduced soon. Escrow service is acceptable. Net terms for regular customers is not a problem. Working with us is totally safe for you.
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Specifications of PIC16C74-04/L | |||
|---|---|---|---|
| Core Processor | PIC | Core Size | 8-Bit |
| Speed | 4MHz | Connectivity | I²C, SPI, UART/USART |
| Peripherals | POR, PWM, WDT | Number Of I /o | 33 |
| Program Memory Size | 7KB (4K x 14) | Program Memory Type | OTP |
| Ram Size | 192 x 8 | Voltage - Supply (vcc/vdd) | 4 V ~ 6 V |
| Data Converters | A/D 8x8b | Oscillator Type | External |
| Operating Temperature | 0°C ~ 70°C | Package / Case | 44-PLCC |
| For Use With | DVA16XL441 - ADAPTER DEVICE ICE 44PLCC | Lead Free Status / RoHS Status | Request inventory verification / Request inventory verification |
| Eeprom Size | - | ||
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PrevNext
7.0
TIMER0 MODULE
Applicable Devices
72 73 73A 74 74A 76 77
The Timer0 module timer/counter has the following fea-
tures:
• 8-bit timer/counter
• Readable and writable
• 8-bit software programmable prescaler
• Internal or external clock select
• Interrupt on overflow from FFh to 00h
• Edge select for external clock
Figure 7-1 is a simplified block diagram of the Timer0
module.
Timer mode is selected by clearing bit T0CS
(OPTION<5>). In timer mode, the Timer0 module will
increment every instruction cycle (without prescaler). If
the TMR0 register is written, the increment is inhibited
for the following two instruction cycles (Figure 7-2 and
Figure 7-3). The user can work around this by writing
an adjusted value to the TMR0 register.
Counter mode is selected by setting bit T0CS
(OPTION<5>). In counter mode, Timer0 will increment
either on every rising or falling edge of pin RA4/T0CKI.
The incrementing edge is determined by the Timer0
FIGURE 7-1:
TIMER0 BLOCK DIAGRAM
F
/4
0
OSC
1
RA4/T0CKI
pin
T0SE
T0CS
Note 1: T0CS, T0SE, PSA, PS2:PS0 (OPTION<5:0>).
2: The prescaler is shared with Watchdog Timer (refer to Figure 7-6 for detailed block diagram).
FIGURE 7-2:
TIMER0 TIMING: INTERNAL CLOCK/NO PRESCALE
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
PC
(Program
Counter)
PC-1
PC
Instruction
MOVWF TMR0
Fetch
T0
T0+1
TMR0
Instruction
Executed
1997 Microchip Technology Inc.
Source Edge Select bit T0SE (OPTION<4>). Clearing
bit T0SE selects the rising edge. Restrictions on the
external clock input are discussed in detail in
Section 7.2.
The prescaler is mutually exclusively shared between
the Timer0 module and the Watchdog Timer. The pres-
caler assignment is controlled in software by control bit
PSA (OPTION<3>). Clearing bit PSA will assign the
prescaler to the Timer0 module. The prescaler is not
readable or writable. When the prescaler is assigned to
the Timer0 module, prescale values of 1:2, 1:4, ...,
1:256 are selectable. Section 7.3 details the operation
of the prescaler.
7.1
Timer0 Interrupt
Applicable Devices
72 73 73A 74 74A 76 77
The TMR0 interrupt is generated when the TMR0 reg-
ister overflows from FFh to 00h. This overflow sets bit
T0IF (INTCON<2>). The interrupt can be masked by
clearing bit T0IE (INTCON<5>). Bit T0IF must be
cleared in software by the Timer0 module interrupt ser-
vice routine before re-enabling this interrupt. The
TMR0 interrupt cannot awaken the processor from
SLEEP since the timer is shut off during SLEEP. See
Figure 7-4 for Timer0 interrupt timing.
PSout
1
Sync with
Internal
clocks
Programmable
0
Prescaler
(2 cycle delay)
3
PS2, PS1, PS0
PSA
PC+1
PC+2
PC+3
MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W
MOVF TMR0,W
T0+2
NT0
NT0
Read TMR0
Read TMR0
Read TMR0
Write TMR0
reads NT0
reads NT0
reads NT0
executed
PIC16C7X
Data bus
8
TMR0
PSout
Set interrupt
flag bit T0IF
on overflow
PC+4
PC+5
PC+6
MOVF TMR0,W
NT0
NT0+1
NT0+2
T0
Read TMR0
Read TMR0
reads NT0 + 1
reads NT0 + 2
DS30390E-page 59
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