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© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
User manual Rev. 02 — 23 May 2005 45 of 133
Philips Semiconductors
UM10109
P89LPC932A1 User manual
010 0 00 Low frequency crystal Low frequency crystal
/DIVM
01
10
11 Low frequency crystal
/DIV
1 00 Low frequency crystal Internal RC oscillator
01
10
11 Internal RC oscillator
011 0 00 High frequency crystal Internal RC oscillator
/DIVM
01 Medium frequency crystal
10 Low frequency crystal
11 Internal RC oscillator
/DIVM
1 00 High frequency crystal Internal RC oscillator
01 Medium frequency crystal
10 Low frequency crystal
11 Internal RC oscillator
100 0 00 High frequency crystal Watchdog oscillator
/DIVM
01 Medium frequency crystal
10 Low frequency crystal
11 Watchdog oscillator /DIVM
1 00 High frequency crystal Internal RC oscillator
01 Medium frequency crystal
10 Low frequency crystal
11 Internal RC oscillator
101 x xx undefined undefined
110 x xx undefined undefined
111 0 00 External clock input External clock input
/DIVM
01
10
11 External clock input /DIVM
1 00 External clock input Internal RC oscillator
01
10
11 Internal RC oscillator
Table 26: Real-time Clock Control register (RTCCON - address D1h) bit allocation
Bit 7 6 5 4 3 2 1 0
Symbol RTCF RTCS1 RTCS0 - - - ERTC RTCEN
Reset011xxx00
Table 25: Real-time Clock/System Timer clock sources
…continued
FOSC2:0 RCCLK RTCS1:0 RTC clock source CPU clock source