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): 57/90頁
文件大?。?/td> 647K
代理商: GPTRM
GPT
REFERENCE MANUAL
SPECIAL MODES
MOTOROLA
9-3
caler is incremented. The INCP bit can be repeatedly set and will increment the pres-
caler and input synchronizers each time. The INCP bit has no effect when the STOPP
bit is not set.
There should be at least one bus cycle between writing prescaler control bits and set-
ting INCP while single-stepping to guarantee proper operation. Writing back to back
cycles may result in unpredictable behavior.
9.5 Supervisor Mode
Certain registers in the GPT are always in supervisor data space, and the other regis-
ters are programmable to be in supervisor or unrestricted data space. The supervisor
(SUPV) bit in the MCR selects the space in which these programmable registers re-
side.
If the SUPV bit is set, the space is designated as supervisor only. Access is then per-
mitted only when the CPU is operating in supervisor mode. Attempts to access the reg-
isters with user software (user data space) will cause the bus cycle to be transferred
externally. Results can then be unpredictable depending on the hardware environ-
ment. If SUPV is clear, then both user and supervisor accesses are permitted. At-
tempting to access a supervisor-only register, i.e., ones denoted with an “S” from user
software, causes the GPT to respond as if an unimplemented register was accessed.
Writes have no effect and reads return zeros. Refer to the GPT register map,
Table 1-
1
, to determine which registers are supervisor only or assignable to either data space.
Figure 9-1 Module Configuration Register (MCR)
STOP — Stop Clocks
0 = Internal clocks are not shut down.
1 = Internal clocks are shut down.
FRZ1 — This bit is not implemented at this time.
FRZ0 — FREEZE Response
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.
MCR —
GPT Module Configuration Register
$YFF900
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
STOP
FRZ1
FRZ0
STOPP
INCP
0
0
0
SUPV
0
0
0
IARB3
IARB2
IARB1
IARB0
RESET:
0
0
0
0
0
0
0
0
1
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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