PIC10F222 Microchip Technology Inc., PIC10F222 Datasheet - Page 31

• Manufacturer Part Number: PIC10F222
• Description: High-performance Microcontrollers With 8-bit A/d
• Manufacturer: Microchip Technology Inc.

8.0
What sets a microcontroller apart from other proces-
sors are special circuits that deal with the needs of real-
time applications. The PIC10F220/222 microcontrol-
lers have a host of such features intended to maximize
system reliability, minimize cost through elimination of
external components, provide power-saving operating
modes and offer code protection. These features are:
• Reset:
• Sleep
• Code Protection
• ID Locations
• In-Circuit Serial Programming™
• Clock Out
REGISTER 8-1:
© 2007 Microchip Technology Inc.
bit 11
Legend:
R = Readable bit
-n = Value at POR
bit 11-5
bit 4
bit 3
bit 2
bit 1
bit 0
Note 1:
- Power-on Reset (POR)
- Device Reset Timer (DRT)
- Watchdog Timer (WDT)
- Wake-up from Sleep on pin change
—
2:
SPECIAL FEATURES OF THE
CPU
Unimplemented: Read as ‘0’
MCLRE: GP3/MCLR Pin Function Select bit
1 = GP3/MCLR pin function is MCLR
0 = GP3/MCLR pin function is digital I/O, MCLR internally tied to V
CP: Code Protection bit
1 = Code protection off
0 = Code protection on
WDTE: Watchdog Timer Enable bit
1 = WDT enabled
0 = WDT disabled
MCPU: Master Clear Pull-up Enable bit
1 = Pull-up disabled
0 = Pull-up enabled
IOSCFS: Internal Oscillator Frequency Select bit
1 = 8 MHz
0 = 4 MHz
Refer to the “PIC10F220/222 Memory Programming Specification” (DS41266), to determine how to
access the Configuration Word. The Configuration Word is not user addressable during device operation.
MCLRE must be a ‘1’ to enable this selection.
—
CONFIG: CONFIGURATION WORD
—
‘1’ = Bit is set
W = Writable bit
—
—
(2)
—
—
The PIC10F220/222 devices have a Watchdog Timer,
which can be shut off only through Configuration bit
WDTE. It runs off of its own RC oscillator for added reli-
ability. When using DRT, there is an 1.125 ms (typical)
delay only on V
most applications need no external Reset circuitry.
The Sleep mode is designed to offer a very low current
Power-Down mode. The user can wake-up from Sleep
through a change on input pins or through a Watchdog
Timer time-out.
8.1
The PIC10F220/222 Configuration Words consist of 12
bits. Configuration bits can be programmed to select
various device configurations. One bit is the Watchdog
Timer enable bit, one bit is the MCLR enable bit and
one bit is for code protection (see Register 8-1).
(1)
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
MCLRE
Configuration Bits
DD
PIC10F220/222
DD
CP
power-up. With this timer on-chip,
WDTE
x = Bit is unknown
MCPU
DS41270E-page 33
IOSCFS
bit 0