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Philips Semiconductors
User’s Manual - Preliminary -
P89LPC901/902/903
REAL-TIME CLOCK/SYSTEM TIMER
2003 Dec 8 52
Table 6-1: Real-time Clock/System Timer Clock Source - P89LPC901
FOSC2
(UCFG1.2)
FOSC1
(UCFG1.1)
FOSC0
(UCFG1.0)
RTCS1:0
CCLK Frequency RTC Clock Frequency
000
00
High frequency crystal/DIVM
High frequency crystal
(XCLK)
01
10
11
High frequency crystal/DIVM
(CCLK)
001
00
Medium frequency crystal/DIVM
Medium frequency crystal
(XCLK)
01
10
11
Medium frequency crystal/
DIVM (CCLK)
010
00
Low frequency crystal/DIVM
Low frequency crystal
(XCLK)
01
10
11
Low frequency crystal/DIVM
(CCLK)
011
00
RC Oscillator/DIVM
High frequency crystal
(XCLK)
01
Medium frequency crystal
(XCLK)
10
Low frequency crystal
(XCLK)
11 RC Oscillator/DIVM (CCLK)
100
00
WDT Oscillator/DIVM
High frequency crystal
(XCLK)
01
Medium frequency crystal
(XCLK)
10
Low frequency crystal
(XCLK)
11
WDT Oscillator/DIVM
(CCLK)
101
xx undefined
110
111
00
external clock/DIVM
external clock
(XCLK)
01
10
11 external clock/DIVM (CCLK)