PIC16C620A-04I/SO Microchip Technology, PIC16C620A-04I/SO Datasheet - Page 37

• Manufacturer Part Number: PIC16C620A-04I/SO
• Description: IC MCU OTP 512X14 COMP 18SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C620A-04I/SO

• Program Memory Type: OTP
• Program Memory Size: 896B (512 x 14)
• Package / Case: 18-SOIC (7.5mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 13
• Ram Size: 96 x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 96 B
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 13
• Number Of Timers: 1
• Operating Supply Voltage: 3 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: ICE2000, DM163022
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

6.3.1
The prescaler assignment is fully under software
control (i.e., it can be changed “on-the-fly” during
program execution). To avoid an unintended device
RESET,
(Example 6-1) must be executed when changing the
prescaler assignment from Timer0 to WDT.)
EXAMPLE 6-1:
TABLE 6-1:
 2003 Microchip Technology Inc.
10.BCF
Address Name
01h
0Bh/8Bh
81h
85h
Legend: — = Unimplemented locations, read as ‘0’, u = unchanged, x = unknown
1.BCF
2.CLRWDT
3.CLRF
4.BSF
5.MOVLW
6.MOVWF
7.CLRWDT
8.MOVLW
9.MOVWF
Note:
the
SWITCHING PRESCALER
ASSIGNMENT
TMR0
INTCON
OPTION
TRISA
Shaded bits are not used by TMR0 module.
STATUS, RP0
TMR0
STATUS, RP0
'00101111’b;
OPTION
'00101xxx’b
OPTION
STATUS, RP0
REGISTERS ASSOCIATED WITH TIMER0
following
Bit 7
Timer0 module register
RBPU
CHANGING PRESCALER
(TIMER0→WDT)
GIE
—
;Skip if already in
;Bank 0
;Clear WDT
;Clear TMR0 & Prescaler
;Bank 1
;These 3 lines (5, 6, 7)
;are required only if
;desired PS<2:0> are
;000 or 001
;Set Postscaler to
;desired WDT rate
;Return to Bank 0
Bit 6
INTEDG
instruction
PEIE
—
Bit 5
T0CS
T0IE
—
sequence
Bit 4
TRISA4
T0SE
INTE
Bit 3
TRISA3
RBIE
PSA
To change prescaler from the WDT to the TMR0
module, use the sequence shown in Example 6-2. This
precaution must be taken even if the WDT is disabled.
EXAMPLE 6-2:
BSF
MOVLW
MOVWF
BCF
CLRWDT
Bit 2
TRISA2
T0IF
PS2
Bit 1
TRISA1
INTF
STATUS, RP0
PS1
STATUS, RP0
b'xxxx0xxx'
OPTION_REG
Bit 0
TRISA0 ---1 1111 ---1 1111
RBIF
PS0
CHANGING PRESCALER
(WDT→TIMER0)
PIC16C62X
Value on
POR
xxxx xxxx uuuu uuuu
0000 000x 0000 000u
1111 1111 1111 1111
;Select TMR0, new
;Clear WDT and
;prescaler
;prescale value and
;clock source
DS30235J-page 35
Value on
All Other
RESETS