![Freescale Semiconductor MPC5553 Скачать руководство пользователя страница 663](http://html1.mh-extra.com/html/freescale-semiconductor/mpc5553/mpc5553_reference-manual_2330655663.webp)
MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
17-24
Freescale Semiconductor
17.4.3
Global Clock Prescaler Submodule (GCP)
The GCP divides the system clock to generate a clock for the clock prescalers of the unified channels. The
system clock is prescaled by the value defined in
according to the GPRE[0:7] bits in the
EMIOS_MCR. The output is clocked every time the counter overflows. Counting is enabled by setting
EMIOS_MCR[GPREN]. The counter can be stopped at any time by clearing this bit, thereby stopping the
internal counter in all the unified channels.
17.4.3.1
Effect of Freeze on the GCP
When the FRZ bit in the EMIOS_MCR is set and the module is in debug mode, the operation of GCP
submodule is not affected; that is, there is no freeze function in this submodule.
17.4.4
Unified Channel (UC)
shows the unified channel block diagram. Each unified channel consists of the following:
•
Counter bus selector that selects the time base to be used by the channel for all timing functions
•
Programmable clock prescaler
•
Two double buffered data registers A and B that allow up to two input capture and/or output
compare events to occur before software intervention is needed.
•
Two comparators (equal only) A and B that compare the selected counter bus with the value in the
data registers
•
Internal counter that can be used as a local time base or to count input events
•
Programmable input filter that ensures that only valid pin transitions are received by a channel
•
Programmable input edge detector that detects rising, falling, or both edges
•
Output flip-flop that holds the logic level to be applied to the output pin
•
eMIOS status and control registers
•
Output disable input selector that selects the output disable input signal to be used as the unified
channel output disable
•
Control state machine (FSM)
The major components and functions of the MPC5553/MPC5554 unified channels are discussed in
Section 17.4.4.1, “Programmable Input Filter (PIF)
Section 17.4.4.4, “Modes of Operation of the
.”
Содержание MPC5553
Страница 5: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 2 Freescale Semiconductor...
Страница 21: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 xvi Freescale Semiconductor...
Страница 47: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 1 26 Freescale Semiconductor...
Страница 163: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 4 20 Freescale Semiconductor...
Страница 179: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 5 16 Freescale Semiconductor...
Страница 561: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 13 38 Freescale Semiconductor...
Страница 615: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 14 54 Freescale Semiconductor...
Страница 707: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 17 68 Freescale Semiconductor...
Страница 755: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 18 48 Freescale Semiconductor...
Страница 873: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 19 118 Freescale Semiconductor...
Страница 984: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 Freescale Semiconductor 21 41...
Страница 985: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 21 42 Freescale Semiconductor...
Страница 1019: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 22 34 Freescale Semiconductor...
Страница 1129: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 25 90 Freescale Semiconductor...
Страница 1207: ...Revision History 4 Freescale Semiconductor...