PIC16LC924-04I/PT Microchip Technology, PIC16LC924-04I/PT Datasheet - Page 49

• Manufacturer Part Number: PIC16LC924-04I/PT
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,64PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16LC924-04I/PT

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: I²C, SPI
• Peripherals: LCD, POR, PWM, WDT
• Number Of I /o: 25
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: OTP
• Ram Size: 176 x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 6 V
• Data Converters: A/D 5x8b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.3.1
The prescaler assignment is fully under software con-
trol, i.e., it can be changed “on the fly” during program
execution.
EXAMPLE 7-1:
To change prescaler from the WDT to the Timer0 mod-
ule use the precaution shown in Example 7-2.
EXAMPLE 7-2:
TABLE 7-1: REGISTERS ASSOCIATED WITH TIMER0
Lines 2 and 3 do NOT have to
be included if the final desired
prescale value is other than 1:1.
If 1:1 is final desired value, then
a temporary prescale value is
set in lines 2 and 3 and the final
prescale value will be set in lines
10 and 11.
Address
01h, 101h
0Bh, 8Bh,
10Bh, 18Bh
81h, 181h
85h
Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by Timer0.
1997 Microchip Technology Inc.
CLRWDT
BSF
MOVLW
MOVWF
BCF
SWITCHING PRESCALER ASSIGNMENT
Name
TMR0
INTCON
TRISA
OPTION RBPU INTEDG
STATUS, RP0 ;Select Bank1
b'xxxx0xxx' ;Select TMR0, new prescale value and
OPTION_REG
STATUS, RP0 ;Select Bank0
CHANGING PRESCALER (TIMER0 WDT)
CHANGING PRESCALER (WDT TIMER0)
Timer0 module’s register
Bit 7
GIE
—
;Clear WDT and prescaler
;clock source
PEIE
Bit 6
—
1)
2)
3)
4)
5)
6)
7)
8)
9)
10) MOVLW
11) MOVWF
12) BCF
PORTA Data Direction Control Register
BSF
MOVLW
MOVWF
BCF
CLRF
BSF
MOVLW
MOVWF
CLRWDT
T0CS
Bit 5
T0IE
STATUS, RP0
b'xx0x0xxx'
OPTION_REG
STATUS, RP0
TMR0
STATUS, RP1
b'xxxx1xxx'
OPTION_REG
b'xxxx1xxx'
OPTION_REG
STATUS, RP0
T0SE
Bit 4
INTE
RBIE
Bit 3
PSA
;Select Bank1
;Select clock source and prescale value of
;other than 1:1
;Select Bank0
;Clear TMR0 and prescaler
;Select Bank1
;Select WDT, do not change prescale value
;
;Clears WDT and prescaler
;Select new prescale value and WDT
;
;Select Bank0
Note:
Bit 2
T0IF
PS2
To avoid an unintended device RESET, the
following instruction sequence (shown in
Example 7-1) must be executed when
changing the prescaler assignment from
Timer0 to the WDT. This precaution must
be followed even if the WDT is disabled.
Bit 1
INTF
PS1
RBIF
Bit 0
PS0
PIC16C9XX
xxxx xxxx
0000 000x
1111 1111
--11 1111
Power-on
Value on
Reset
DS30444E - page 49
other resets
Value on all
uuuu uuuu
0000 000u
1111 1111
--11 1111