MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 343

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MC9S12G

Manufacturer Part Number
MC9S12G
Description
Ignores external trigger. Performs one conversion sequence and stops.
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet

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Freescale Semiconductor
OSCSEL1
PLLSEL
PSTP
Field
COP
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
PRE
PCE
7
6
4
3
2
PLL Select Bit
This bit selects the PLLCLK as source of the System Clocks (Core Clock and Bus Clock).
PLLSEL can only be set to 0, if UPOSC=1.
UPOSC= 0 sets the PLLSEL bit.
Entering Full Stop Mode sets the PLLSEL bit.
0 System clocks are derived from OSCCLK if oscillator is up (UPOSC=1, f
1 System clocks are derived from PLLCLK, f
Pseudo Stop Bit
This bit controls the functionality of the oscillator during Stop Mode.
0 Oscillator is disabled in Stop Mode (Full Stop Mode).
1 Oscillator continues to run in Stop Mode (Pseudo Stop Mode), option to run RTI and COP.
Note: Pseudo Stop Mode allows for faster STOP recovery and reduces the mechanical stress and aging of the
Note: When starting up the external oscillator (either by programming OSCE bit to 1 or on exit from Full Stop
COP Clock Select 1 — COPOSCSEL0 and COPOSCSEL1 combined determine the clock source to the COP
(see also
If COPOSCSEL1 = 1, COPOSCSEL0 has no effect regarding clock select and changing the COPOSCSEL0 bit
does not re-start the COP time-out period.
COPOSCSEL1 selects the clock source to the COP to be either ACLK (derived from trimmable internal
RC-Oscillator) or clock selected via COPOSCSEL0 (IRCCLK or OSCCLK
Changing the COPOSCSEL1 bit re-starts the COP time-out period.
COPOSCSEL1 can be set independent from value of UPOSC.
UPOSC= 0 does not clear the COPOSCSEL1 bit.
0 COP clock source defined by COPOSCSEL0
1 COP clock source is ACLK derived from a trimmable internal RC-Oscillator
RTI Enable During Pseudo Stop Bit — PRE enables the RTI during Pseudo Stop Mode.
0 RTI stops running during Pseudo Stop Mode.
1 RTI continues running during Pseudo Stop Mode if RTIOSCSEL=1.
Note: If PRE=0 or RTIOSCSEL=0 then the RTI will go static while Stop Mode is active. The RTI counter will not
COP Enable During Pseudo Stop Bit — PCE enables the COP during Pseudo Stop Mode.
0 COP stops running during Pseudo Stop Mode if: COPOSCSEL1=0 and COPOSCSEL0=0
1 COP continues running during Pseudo Stop Mode if: PSTP=1, COPOSCSEL1=0 and COPOSCSEL0=1
Note: If PCE=0 or COPOSCSEL0=0 while COPOSCSEL1=0 then the COP is static during Stop Mode being
resonator in case of frequent STOP conditions at the expense of a slightly increased power consumption.
Mode with OSCE bit is already 1) the software must wait for a minimum time equivalent to the startup-time
of the external oscillator t
be reset.
active. The COP counter will not be reset.
Table
10-6).
MC9S12G Family Reference Manual, Rev.1.01
Table 10-5. CPMUCLKS Descriptions
UPOSC
before entering Pseudo Stop Mode.
bus
= f
Description
PLL
/ 2.
S12 Clock, Reset and Power Management Unit (S12CPMU)
)
.
bus
= f
osc
/ 2.
343

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