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參數(shù)資料
型號(hào): MC68HC916X1
廠商: Motorola, Inc.
英文描述: 16-Bit Modular Microcontroller(16位模塊化微控制器)
中文描述: 16位微控制器模塊(16位模塊化微控制器)
文件頁數(shù): 25/172頁
文件大小: 1035K
代理商: MC68HC916X1
MC68HC916X1
MC68HC916X1TS/D
MOTOROLA
25
PIV[7:0] — Periodic Interrupt Vector
The bits of this field contain the vector generated in response to an interrupt from the periodic timer.
When the SCIM responds, the periodic interrupt vector is placed on the bus.
PITR contains the count value for the periodic timer. A zero value turns off the periodic timer. This
register can be read or written at any time.
PTP — Periodic Timer Prescaler Control
1 = Periodic timer clock prescaled by a value of 512
0 = Periodic timer clock not prescaled
The reset state of PTP is the complement of the state of the MODCLK signal during reset.
PITM[7:0] — Periodic Interrupt Timing Modulus Field
The PIT period can be calculated as follows:
where
PIT Period = Periodic interrupt timer period
PITM[7:0] = Periodic interrupt timer register modulus
f
ref
= Synthesizer reference of external clock input frequency
Prescale = 512 or 1 depending on the state of the PTP bit in PITR
3.4 System Protection
System protection includes a bus monitor, a halt monitor, a spurious interrupt monitor, and a soft-
ware watchdog timer. These functions reduce the number of external components required for a
complete control system.
Figure 8
shows the SCIM system protection block diagram.
Table 14 Periodic Interrupt Request Levels
PIRQL
000
001
010
011
100
101
110
111
Interrupt Request Level
Periodic Interrupt Disabled
Interrupt Request Level 1
Interrupt Request Level 2
Interrupt Request Level 3
Interrupt Request Level 4
Interrupt Request Level 5
Interrupt Request Level 6
Interrupt Request Level 7
PITR
— Periodic Interrupt Timer Register
$YFFA24
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
PTP
PITM[7:0]
RESET:
0
0
0
0
0
0
0
MODCLK
0
0
0
0
0
0
0
0
PIT Period
PITM[7:0]
)
Prescale
fref
------------------------------------------------------------- 4
)
=
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