參數(shù)資料
型號(hào): GPTRM
英文描述: General-Purpose Timer Reference Manual
中文描述: 通用定時(shí)器參考手冊(cè)
文件頁數(shù): 78/90頁
文件大小: 647K
代理商: GPTRM
MOTOROLA
A-2
MEMORY MAP AND REGISTERS
GPT
REFERENCE MANUAL
STOP — Stop Clocks
0 = Internal clocks are not shut down.
1 = Internal clocks are shut down.
FRZ1 — FREEZE Response 1
Reserved; has no effect
FRZ0 — FREEZE Response 0
0 = Ignore FREEZE.
1 = Freeze the current state of the GPT when FREEZE is asserted.
STOPP— Stop Prescaler
0 = Normal operation.
1 = Stop the prescaler and pulse accumulator from incrementing; ignore changes
to input pins.
INCP — Increment Prescaler
0 = Has no meaning.
1 = If STOPP is asserted, increment the prescaler once and clock the input syn-
chronizers once.
SUPV — Supervisor/Unrestricted Data Space
0 = Registers with access controlled by the SUPV bit are unrestricted (FC2 is a
don't care).
1 = Registers with access controlled by the SUPV bit are restricted to supervisor
access.
IARB[3:0] — Interrupt Arbitration ID
The interrupt structure of the IMB supports a total of 15 internal interrupt sources. Ex-
ternal interrupts are grouped as one of the internal sources. Each source supports sev-
en interrupts levels. A level 7 interrupt has the highest priority. Each of the 15 internal
sources is assigned a unique ID, the interrupt arbitration ID, which is used to determine
which interrupt will be serviced if two or more interrupts of the same priority occur at
the same time.
These sources must arbitrate for the interrupt during the IACK cycle. The module with
the higher ID wins the arbitration. System software must set this field to $F–$1, $F be-
ing the highest priority. This field is initialized to zero during reset, which disables ar-
bitration and causes interrupts generated by the module to be treated as spurious.
MTR
— GPT Module Test Register
No module test register is implemented on the GPT. However, this address location is
reserved for future needs.
$YFF902
ICR —
GPT Interrupt Configuration Register
$YFF904
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
PAB
0
IRL
VBA
0
0
0
0
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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