PIC16C74A-04/PQ Microchip Technology, PIC16C74A-04/PQ Datasheet - Page 5

• Manufacturer Part Number: PIC16C74A-04/PQ
• Description: IC MCU OTP 4KX14 A/D PWM 44-MQFP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C74A-04/PQ

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, 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-MQFP, 44-PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

3. Module: SSP (SPI
TABLE 3:
4. Module: Timer1
FIGURE 1:
 2001 Microchip Technology Inc.
Param
71
71A
72
72A
73A
* This parameter is characterized but not tested.
Note 1: Specification 73A is only required if specifications 71A and 72A are used.
TMR1 Increment
Clock (Input to Prescaler)
Write to TMR1H
and/or TMR1L Register(s)
TMR1H:TMR1L Increments
No.
The SPI interface timings (parameters 71, 71A, 72,
72A, 73, and 73A) have been modified. The new
values are shown in Table 3.
The operation of Timer1 needs some clarification
when the timer registers are written when the
TMR1ON bit is set.
The internal clock signal that is the input to the
TMR1 prescaler affects the incrementing of Timer1
(TMR1H:TMR1L registers and the Timer1 pres-
caler). When the Timer1 registers are NOT written,
the Timer1 will increment on the rising edge of the
TMR1 increment clock.
When the TMR1H and/or TMR1L registers are
written while this clock is high, TMR1 will incre-
ment on the next rising edge of this clock.
T
T
T
Sym.
SC
SC
B
2
H
L
B
Specifications)
SCK input high time
(slave mode)
SCK input low time
(slave mode)
Last clock edge of the Byte1 to 1st
clock edge of the Byte2
DC SPECIFICATION CHANGES FROM DATA SHEET
WRITES TO TIMER1 (EXTERNAL CLOCK/OSCILLATOR MODE)
TM
Characteristic
Mode Timing
Continuous
Single Byte
Continuous
Single Byte
(1)
(1)
(1)
Write to TMR1H
and/or TMR1L Register(s)
1.25 T
1.25 T
+ 30 ns
+ 30 ns
1.5 T
+ 40 ns
New Specification
Min
TMR1H:TMR1L Increments
40
40
CY
CY
CY
Typ
When the TMR1H and/or TMR1L registers are
written while this clock is low, TMR1 will not incre-
ment on the next rising edge of this clock, but must
first have a falling clock and the rising clock, for
TMR1 to increment.
Figure 1 shows the two cases of writes to the
TMR1H and/or TMR1L registers. Due to the V
and V
external Timer1 oscillator components, and exter-
nal clock frequency, the Timer1 increment clock
may not be of a 50% duty cycle.
The TMR1 increment clock is out of phase of the
T1OSO/T1CKI pin by a small propagation delay.
—
—
—
—
—
IL
Max
—
—
—
—
—
thresholds on the oscillator/clock pins,
+ 20 ns
+ 20 ns
Min
T
T
CY
CY
Specification
PIC16C74A
Data Sheet
N.A.
N.A.
N.A.
Typ
—
—
DS80089A-page 5
Max
—
—
Units
ns
ns
ns
ns
ns
IH