ST7FMC1K2B3 STMICROELECTRONICS [STMicroelectronics], ST7FMC1K2B3 Datasheet - Page 36

• Manufacturer Part Number: ST7FMC1K2B3
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST7MC1xx/ST7MC2xx
SYSTEM INTEGRITY MANAGEMENT (Cont’d)
SYSTEM INTEGRITY (SI) CONTROL/STATUS REGISTER (SICSR, page 1)
Reset Value: 00000000 (00h)
Bit 7 = PAGE SICSR Register Page Selection
This bit selects the SICSR register page. It is set
and cleared by software
0: Access to SICSR register mapped in page 0.
1: Access to SICSR register mapped in page 1.
Bit 6 = Reserved, must be kept cleared.
Bit 5 = VCOEN VCO Enable
This bit is set and cleared by software.
0: VCO (Voltage Controlled Oscillator) connected
1: VCO tied to ground in order to obtain a 10-MHz
Notes:
1. During ICC session, this bit is set to 1 in order to
have an internal frequency which does not depend
on the input clock. Then, it can be reset in order to
run faster with an external oscillator.
Bit 4 = LOCK PLL Locked
This bit is read only. It is set by hardware. It is set
automatically when the PLL reaches its operating
frequency.
0: PLL not locked
1: PLL locked
36/309
1
GE
PA
to the output of the PLL charge pump (default
mode), to obtain a 16-MHz output frequency
(with an 8-MHz input frequency).
frequency (f
7
0
VCO
vco
EN
)
CK
LO
PLL
EN
0
SEL
CK-
0
0
Bit 3 = PLLEN PLL Enable
This bit enables the PLL and the clock detector. It
is set and cleared by software.
0: PLL and Clock Detector (CKD) disabled
1: PLL and Clock Detector (CKD) enabled
Notes:
1. During ICC session, this bit is set to 1.
2. PLL cannot be disabled if PLL clock source is
selected (CKSEL= 1).
Bit 2 = Reserved, must be kept cleared.
Bit 1 = CKSEL Clock Source Selection
This bit selects the clock source: oscillator clock or
clock from the PLL. It is set and cleared by soft-
ware. It can also be set by option byte (PLL opt)
0: Oscillator clock selected
1: PLL clock selected
Notes:
1. During ICC session, this bit is set to 1. Then,
CKSEL can be reset in order to run with f
2. Clock from the PLL cannot be selected if the
PLL is disabled (PLLEN =0)
3. If the clock source is selected by PLL option bit,
CKSEL bit selection has no effect.
Bit 0 = Reserved, must be kept cleared.
OSC
.