參數(shù)資料
型號: GPTRM
英文描述: General-Purpose Timer Reference Manual
中文描述: 通用定時器參考手冊
文件頁數(shù): 81/90頁
文件大?。?/td> 647K
代理商: GPTRM
GPT
REFERENCE MANUAL
MEMORY MAP AND REGISTERS
MOTOROLA
A-5
I4/O5 — Input Capture 4/Output Compare 5
0 = Output compare 5 function enabled
1 = Input capture 4 function enabled
PACLK[1:0] — Pulse Accumulator Clock Select (Gated Mode)
Pulse Accumulator Counter
This is an 8-bit read/write counter used for external event counting or gated time ac-
cumulation.
TIC1–TIC3
— Input Capture Registers 1–3
The input capture registers are 16-bit read-only registers which are used to latch the
value of TCNT when a specified transition is detected on the corresponding input cap-
ture pin. They are reset to $FFFF.
$YFF90E, $YFF910, $YFF912
TOC1–TOC4
— Output Compare Registers 1–4
$YFF914, $YFF916, $YFF918, $YFF91A
The output compare registers are 16-bit read/write registers which can be used as out-
put waveform controls or as elapsed time indicators. For output compare functions,
they are written to a desired match value and compared against TCNT to control spec-
ified pin actions. They are reset to $FFFF.
TI4/O5
— Input Capture 4/Output Compare 5 Register
This register serves either as input capture register 4 or output compare register 5, de-
pending on the function chosen for the I4/O5 pin.
$YFF91C
OMx — Output Compare Mode Bits
OLx — Output Compare Level Bits
These bits are encoded to specify the output action to be taken as a result of a suc-
cessful OCx compare.
PACLK1
0
0
1
1
PACLK0
0
1
0
1
Pulse Accumulator Clock Selected
System Clock Divided by 512
Same Clock Used to Increment TCNT
TOF Flag from TCNT
External Clock, PCLK
TCTL1/TCTL2 —
Timer Control Registers 1–2
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OM5
OL5
OM4
OL4
OM3
OL3
OM2
OL2
EDGE4B EDGE4A EDGE3B EDGE3A EDGE2B EDGE2A EDGE1B EDGE1A
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
OMx–OLx
00
01
10
11
Action Taken on Successful Compare
Timer Disconnected from Output Logic
Toggle OCx Output Line
Clear OCx Output LIne to 0
Set OCx Output Line to 1
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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