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Philips Semiconductors
Table 40:
FOSC2:0
010
011
100
101
110
111
Table 41:
Bit
Symbol
Reset
User manual
Real-time Clock/System Timer clock sources
RCCLK
RTCS1:0
0
00
01
10
11
1
00
01
10
11
0
00
01
10
11
1
00
01
10
11
0
00
01
10
11
1
00
01
10
11
x
xx
x
xx
0
00
01
10
11
1
00
01
10
11
Real-time Clock Control register (RTCCON - address D1h) bit allocation
7
6
5
RTCF
RTCS1
RTCS0
0
1
1
Rev. 03 — 7 June 2005
P89LPC938 User manual
...continued
RTC clock source
Low frequency crystal
Low frequency crystal
/DIV
Low frequency crystal
Internal RC oscillator
High frequency crystal
Medium frequency crystal
Low frequency crystal
Internal RC oscillator
/DIVM
High frequency crystal
Medium frequency crystal
Low frequency crystal
Internal RC oscillator
High frequency crystal
Medium frequency crystal
Low frequency crystal
Watchdog oscillator /DIVM
High frequency crystal
Medium frequency crystal
Low frequency crystal
Internal RC oscillator
undefined
undefined
External clock input
External clock input /DIVM
External clock input
Internal RC oscillator
4
3
2
-
-
-
x
x
x
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
UM10119
CPU clock source
Low frequency crystal
/DIVM
Internal RC oscillator
Internal RC oscillator
/DIVM
Internal RC oscillator
Watchdog oscillator
/DIVM
Internal RC oscillator
undefined
undefined
External clock input
/DIVM
Internal RC oscillator
1
0
ERTC
RTCEN
0
0
52 of 139
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