PIC16C781-I/P Microchip Technology, PIC16C781-I/P Datasheet - Page 104

• Manufacturer Part Number: PIC16C781-I/P
• Description: IC MCU OTP 1KX14 W/AD COMP 20DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C781-I/P

• Core Size: 8-Bit
• Program Memory Size: 1.75KB (1K x 14)
• Core Processor: PIC
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 13
• Program Memory Type: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x8b; D/A 1x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Controller Family/series: PIC16C
• No. Of I/o's: 16
• Ram Memory Size: 128Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Processor Series: PIC16C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 2
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: ICE2000, DM163022
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• On-chip Dac: 8 bit, 1 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: ISPICR1 - ADAPTER IN-CIRCUIT PROGRAMMINGDVA16XP202 - ADAPTER DEVICE PIC16C781/782DM163012 - BOARD DEMO PICDEM FOR 16C781/782AC164028 - MODULE SKT PROMATEII 20SOIC/DIP
• Eeprom Size: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details
• Other names: PIC16C781I/P

PIC16C781/782
13.1.1
In PSM (Pulse Skip Modulation), the PSMC operates
as a fixed duty cycle pulse generator, with its output
gated by the analog feedback (see Figure 13-3). Imme-
diately prior to the initiation of a pulse, the analog feed-
back is sampled. If the comparator output = H, a pulse
is initiated and held active for the programmed duty
FIGURE 13-3:
TABLE 13-3:
Legend: x = Don’t Care
DS41171A-page 102
Beginning of PSM cycle
During Pulse
End of Pulse
SMCCL1
SMCCL0
F
OSC
PULSE SKIP MODULATION (PSM)
C1POL
C2POL
Comparator Module
Time
:1
DC<1:0>
C1
C2
S1
3
PSMC1A OPERATION IN PSM MODE USING C1 COMPARATOR ONLY
S0
:2
2
PSMC MODULE IN SINGLE OUTPUT PSM MODE (SIMPLIFIED BLOCK
DIAGRAM)
:4
PSMC
CLK
1
0 = Inactive
2
:8
0
Controller
4-bit Counter
PSMC
Switch
4
Cycle
New
C1OUT
SMCCS
C2OUT
Max
DC
SC
1 = Active
C1OUT
H
L
x
x
DC = Duty Cycle
New Cycle
Select DC
SC Switch
C1OUT
RB6/C1/
PSMC1A
RB7/C2/
PSMC1B/T1G
EXAMPLE
Preliminary
H = High
ASSUMES S1APOL=0
cycle. If the comparator output = L, no pulse is initiated
and the PSMC waits for the start of the next pulse (see
Table 13-3 and Table 13-4). In this mode, both the fre-
quency and duty cycle of the output pulse are program-
mable. The analog feedback gates the presence or
absence of the pulse on a pulse-by-pulse basis.
Programmed DC
SCEN
L = Low
S1APOL
SMCCS=0
HIGH IMPEDANCE
S
Dominant
R
PSMC1A Output Signal
Set
15/16 Period
Q
Period
No Change
SCEN=1
SMCON=1 SMCOM=0
0
1
V
0
1
DD
N
1
0
2001 Microchip Technology Inc.
PWM/PSM=0
RB6/C1/PSMC1A
RB7/C2/PSMC1B/T1G
HIGH IMPEDANCE