MC9S12E32CFU FREESCALE [Freescale Semiconductor, Inc], MC9S12E32CFU Datasheet - Page 176
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MC9S12E32CFU
Manufacturer Part Number
MC9S12E32CFU
Description
HCS12 Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12E32CFU.pdf
(606 pages)
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Chapter 4 Clocks and Reset Generator (CRGV4)
4.3.2.8
This register selects the timeout period for the real-time interrupt.
Read: anytime
Write: anytime
176
RTR[6:4]
RTR[3:0]
Reset
SCME
Field
Field
PRE
PCE
6:4
3:0
2
1
0
W
R
RTI Enable during Pseudo-Stop Bit — PRE enables the RTI during pseudo-stop mode. Write anytime.
0 RTI stops running during pseudo-stop mode.
1 RTI continues running during pseudo-stop mode.
Note: If the PRE bit is cleared the RTI dividers will go static while pseudo-stop mode is active. The RTI dividers
COP Enable during Pseudo-Stop Bit — PCE enables the COP during pseudo-stop mode. Write anytime.
0 COP stops running during pseudo-stop mode
1 COP continues running during pseudo-stop mode
Note: If the PCE bit is cleared the COP dividers will go static while pseudo-stop mode is active. The COP dividers
Self-Clock Mode Enable Bit — Normal modes: Write once —Special modes: Write anytime — SCME can not
be cleared while operating in self-clock mode (SCM=1).
0 Detection of crystal clock failure causes clock monitor reset (see
1 Detection of crystal clock failure forces the MCU in self-clock mode (see
Real-Time Interrupt Prescale Rate Select Bits — These bits select the prescale rate for the RTI. See
Real-Time Interrupt Modulus Counter Select Bits — These bits select the modulus counter target value to
provide additional granularity.
source clock for the RTI is OSCCLK.
CRG RTI Control Register (RTICTL)
0
0
7
A write to this register initializes the RTI counter.
will not initialize like in wait mode with RTIWAI bit set.
will not initialize like in wait mode with COPWAI bit set.
= Unimplemented or Reserved
RTR6
0
6
Table 4-5. PLLCTL Field Descriptions (continued)
Figure 4-11. CRG RTI Control Register (RTICTL)
Table 4-6. RTICTL Field Descriptions
RTR5
MC9S12E128 Data Sheet, Rev. 1.07
Table 4-7
0
5
shows all possible divide values selectable by the RTICTL register. The
RTR4
NOTE
0
4
Description
Description
RTR3
0
3
Section 4.5.1, “Clock Monitor
RTR2
0
2
Section 4.4.7.2, “Self-Clock
Freescale Semiconductor
RTR1
0
1
Reset”).
Table
RTR0
Mode”).
0
0
4-7.
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