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PIC16C55-RCI/SO 用户编程技术手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
SOIC-28
描述:
PIC16 系列 24 B RAM 512 x 12位 EPROM 8位 CMOS 微控制器 - SOIC-28
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PIC16C55-RCI/SO数据手册
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PIC16C5XX
DS30190H-page 6 1999 Microchip Technology Inc.
2.0 CONFIGURATION WORD
The configuration word is the very first memory location
which is accessed after entering the program/verify
mode of the PIC16C5X. It contains the two bits for the
selection of the oscillator type, the watchdog timer
enable bit, and the code protection bit. All other bits (4
through 11) are read as ’1’s.
One-Time-Programmable (OTP) devices may have the
oscillator configuration bits “FOSC0” and “FOSC1” set
by the factory and are tested accordingly. Therefore, it
is essential that the inputs RA0 and RA1 are held at '1's
when programming the “WDTE” and/or the “CP” bit of
the configuration word. Otherwise, the factory tested
and selected oscillator configuration could be overwrit-
ten and the functionality of the device is not guaranteed
any more.
FIGURE 2-1: CONFIGURATION WORD FOR PIC16CR54A/C54B/CR54B/C54C/CR54C/C55A/C56A/
CR56A/C57C/CR57B/CR57C/C58B/CR58A/CR58B
FIGURE 2-2: CONFIGURATION WORD FOR PIC16C52/C54/C54A/C55/C56/C57/C58A
CP CP CP CP CP CP CP CP CP WDTE FOSC1 FOSC0 Register: CONFIG
Address: FFFh
bit1110987654321bit0
bit 11-3: CP: Code protection bits
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 = RC oscillator
10 = HS oscillator
01 = XT oscillator
00 = LP oscillator
— — — — — — — — CP WDTE FOSC1 FOSC0 Register: CONFIG
Address: FFFh
bit1110987654321bit0
bit 11-4: Unimplemented: Read as ’0’
bit 3: CP: Code protection bit.
1 = Code protection off
0 = Code protection on
bit 2: WDTE: Watchdog timer enable bit
(not implemented on PIC16C52)
1 = WDT enabled
0 = WDT disabled
bit 1-0: FOSC1:FOSC0: Oscillator selection bits
(2)
11 = RC oscillator
10 = HS oscillator
01 = XT oscillator
00 = LP oscillator
Note: PIC16C52 supports XT and RC oscillator only.
PIC16LV54A supports XT, RC and LP oscillator only.
PIC16LV58A supports XT, RC and LP oscillator only.
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