AT91SAM7A1_05 Datasheet, PDF (60/402 Pages) ATMEL Corporation – AT91 ARM Thumb-based Microcontrollers

Table 11-1 lists the different working modes depending on the value set in the CM_CS regis-
ter. The grayed row shows values at reset.
Table 11-1. Clock Selection
CM_C CM_C CM_C CM_C
S7
S6
S3
S5
RTCK
EN
RTCS
EL
LFSL
CT
DIVSL
CT
CM_CS
2
PLLSL
CT
CM_C
S1
PLLDI
V2
CM_C
S8
MCKE
N
CM_C
S9
PLLE
N
CM_CS
13
DIVEN
CM_CS
14
RTCSL
CT
0
X
X
1
X
X
1
0
1
0
0
X
X
0
0
X
1
0
1
0
0
X
0
0
1
0
1
1
1
0
0
X
0
0
1
1
1
1
1
0
1
1
1
X
X
X
0
0
0
1
1
1
0
1
X
X
1
0
1
1
1
1
0
0
0
X
1
0
0
1
1
1
0
0
1
0
1
1
0
1
1
1
0
0
1
1
1
1
0
1
1
0
1
X
X
X
1
0
1
0
1
0
0
1
X
X
1
0
1
0
1
0
0
0
0
X
1
0
1
0
1
0
0
0
1
0
1
1
1
0
1
0
0
0
1
1
1
1
1
0
CORECLK
MCK/
(2x(MDIV+1)
)
MCK
MCKxPMUL
(MCKxPMUL
)
/2
RTCK
MCK/
(2x(MDIV+1)
)
MCK
MCKxPMUL
(MCKxPMUL
)
/2
MCK/
(2x(MDIV+1)
)
MCK/
(2x(MDIV+1)
)
MCK
MCKxPMUL
(MCKxPMUL
)/2
LFCLK
MCK/
(2x(MDIV+
1))
MCK/
(2x(MDIV+
1))
MCK/
(2x(MDIV+
1))
MCK/
(2x(MDIV+
1))
RTCK
RTCK
RTCK
RTCK
RTCK
MCK/
(2x(MDIV+
1))
MCK/
(2x(MDIV+
1))
MCK/
(2x(MDIV+
1))
MCK/
(2x(MDIV+
1))
MCK/
(2x(MDIV+
1))
Mode
SLM
SLM
OPE
OPE
LPM
SLM
SLM
OPE
OPE
SLM
SLM
SLM
OPE
OPE
60 AT91SAM7A1
6048A–ATARM–03-Mar-05