PIC10F220-E/OT Microchip Technology, PIC10F220-E/OT Datasheet - Page 30

• Manufacturer Part Number: PIC10F220-E/OT
• Description: 384B Flash, 16B RAM, 4 I/O, 8bit ADC 6 SOT-23 BAG
• Manufacturer: Microchip Technology
• Series: PIC® 10Fr

Specifications of PIC10F220-E/OT

• Processor Series: PIC10F
• Core: RISC
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 256 B
• Data Ram Size: 16 B
• Interface Type: RS-232, USB
• Maximum Clock Frequency: 8 MHZ
• Number Of Programmable I/os: 4
• Number Of Timers: 1
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-23-6
• Operating Temperature Range: - 40 C to + 125 C
• Processor To Be Evaluated: PIC10F220
• Supply Current (max): 100 nA
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: -
• Peripherals: POR, WDT
• Number Of I /o: 4
• Eeprom Size: -
• Ram Size: 16 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Lead Free Status / Rohs Status: Details

PIC10F220/222
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:
DS41270E-page 28
CLRWDT
CLRF
MOVLW
OPTION
CLRWDT
MOVLW
OPTION
Note 1: T0CS, T0SE, PSA, PS<2:0> are bits in the OPTION register.
GP2/T0CKI
WDT Enable bit
TMR0
‘00xx1111’b ;These 3 lines (5, 6, 7)
‘00xx1xxx’b ;Set Postscaler to
Watchdog
2: T0CKI is shared with pin GP2 on the PIC10F220/222.
SWITCHING PRESCALER
ASSIGNMENT
Timer
Pin
T
CY
(= F
T0SE
(2)
OSC
CHANGING PRESCALER
(TIMER0 → WDT)
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
;Clear WDT
;Clear TMR0 & Prescaler
;are required only if
;desired
;PS<2:0> are 000 or 001
;desired WDT rate
(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
8
MUX
WDT
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:
1
0
CLRWDT
MOVLW
OPTION
1
PSA
M
U
X
(1)
‘xxxx0xxx’
PSA
PS<2:0>
(1)
Cycles
Sync
2
CHANGING PRESCALER
(WDT→TIMER0)
;Clear WDT and
;prescaler
;Select TMR0, new
;prescale value and
;clock source
© 2007 Microchip Technology Inc.
(1)
TMR0 Reg
Data Bus
8