PIC16F506-I/SL Microchip Technology, PIC16F506-I/SL Datasheet - Page 44

• Manufacturer Part Number: PIC16F506-I/SL
• Description: IC PIC MCU FLASH 1KX14 14SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F506-I/SL

• Program Memory Type: FLASH
• Program Memory Size: 1.5KB (1K x 12)
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: POR, WDT
• Number Of I /o: 11
• Ram Size: 67 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 4x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 67 B
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 1
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 3-ch x 8-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC12F510/16F506
6.2.1
The prescaler assignment is fully under software
control (i.e., it can be changed “on-the-fly” during pro-
gram execution). To avoid an unintended device Reset,
the following instruction sequence (Example 6-1) must
be executed when changing the prescaler assignment
from Timer0 to the WDT.
EXAMPLE 6-1:
FIGURE 6-5:
DS41268D-page 42
CLRWDT
CLRF
MOVLW
OPTION
CLRWDT
MOVLW
OPTION
Comparator
Output
Note 1: T0CS, T0SE, PSA, PS<2:0> are bits in the OPTION register.
T0CKI
‘00xx1xxx’b
TMR0
‘00xx1111’b ;These 3 lines (5, 6, 7)
Pin
SWITCHING PRESCALER
ASSIGNMENT
2: T0CKI is shared with pin GP2 on the PIC12F510 and shared with RC5 on the PIC16F506.
3: Bit C1T0CS is located in the CM1CON0 register.
(2)
WDT Enable bit
C1T0CS
Watchdog
CHANGING PRESCALER
(TIMER0 → WDT)
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
Timer
T
;Clear WDT
;Clear TMR0 & Prescaler
;are required only if
;desired
;PS<2:0> are 000 or 001
;Set Postscaler to
;desired WDT rate
1
0
CY
(= F
T0SE
(3)
OSC
(1)
/4)
0
1
PSA
M
U
X
(1)
0
1
T0CS
M
U
X
(1)
8-bit Prescaler
0
8-to-1 MUX
Time-Out
To change prescaler from the WDT to the Timer0
module, use the sequence shown in Example 6-2. This
sequence must be used even if the WDT is disabled. A
CLRWDT instruction should be executed before
switching the prescaler.
EXAMPLE 6-2:
8
CLRWDT
MOVLW
OPTION
MUX
WDT
1
0
1
PSA
‘xxxx0xxx’
M
U
X
(1)
PSA
PS<2:0>
(1)
CHANGING PRESCALER
(WDT→TIMER0)
Cycles
;Clear WDT and
;prescaler
;Select TMR0, new
;prescale value and
;clock source
© 2007 Microchip Technology Inc.
Sync
2
(1)
TMR0 Reg
Data Bus
8