Nxp semiconductors – NXP Semiconductors P89LPC9321 UM10310 User Manual
Page 46
UM10310
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User manual
Rev. 2 — 1 November 2010
46 of 139
NXP Semiconductors
UM10310
P89LPC9321 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 31.
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
Reset
0
1
1
x
x
x
0
0
Table 30.
Real-time Clock/System Timer clock sources
…continued
FOSC2:0
RCCLK
RTCS1:0
RTC clock source
CPU clock source