RFPIC12C509AG Datasheet, PDF (45/104 Pages) Microchip Technology – 18/20-Pin 8-Bit CMOS Microcontroller with UHF ASK/FSK Transmitter

rfPIC12C509AG/509AF
8.0 SPECIAL FEATURES OF THE
CPU
The rfPIC12C509AG/509AF microcontroller has a host
of features intended to maximize system reliability, min-
imize cost through elimination of external components,
provide power saving operating modes and offer code
protection. These features are:
• Oscillator selection
• RESET
- Power-on Reset (POR)
- Device Reset Timer (DRT)
- Wake-up from SLEEP on pin change
• Watchdog Timer (WDT)
• SLEEP
• Code protection
• ID locations
• In-Circuit Serial Programming
The above features are configured by the configuration
bits during programming.
8.1 Configuration Bits
The rfPIC12C509AG/509AF configuration word con-
sists of 12 bits. Configuration bits can be programmed
to select various device configurations. Two bits are for
the selection of the oscillator type, one bit is the Watch-
dog Timer enable bit, one bit for code protection, and
one bit is the MCLR enable bit.
FIGURE 8-1:
CONFIGURATION WORD FOR rfPIC12C509AG/509AF
—
—
—
—
—
—
— MCLRE CP WDTE FOSC1 FOSC0 Register: CONFIG
bit11 10
9
8
7
6
5
4
3
2
1
bit0 Address⁽¹⁾: FFFh
bit 11-5: Unimplemented
bit 4:
MCLRE: MCLR enable bit.
1 = MCLR pin enabled
0 = MCLR tied to VDD, (Internally)
bit 3:
CP: Code protection bit.
1 = Code protection off
0 = Code protection on
bit 2:
WDTE: Watchdog timer enable bit
1 = WDT enabled
0 = WDT disabled
bit 1-0:
FOSC1:FOSC0: Oscillator selection bits
11 = EXTRC - external RC oscillator
10 = INTRC - internal RC oscillator
01 = XT oscillator
00 = LP oscillator
Note 1: Refer to the PIC12C5XX Programming Specifications to determine how to
access the configuration word. This register is not user addressable during
device operation.
© 2001 Microchip Technology Inc.
Preliminary
DS70031A-page 43