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參數(shù)資料
| 型號： | COP885BC |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 8-Bit CMOS ROM Based Microcontrollers with 2k Memory, Comparators, and CAN Interface(8位基于CMOS ROM帶2K存儲器，比較器和CAN接口的微控制器) |
| 中文描述： | 8位的CMOS基于ROM與2K內(nèi)存，比較器和CAN接口（8位基于ROM的帶2K的CMOS存儲器，比較器和CAN微控制器接口的微控制器） |
| 文件頁數(shù)： | 46/57頁 |
| 文件大?。?/td> | 677K |
| 代理商： | COP885BC |
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MICROWIRE/PLUS
(Continued)
TABLE 10. MICROWIRE/PLUS
Master Mode Clock Selection
SL1
0
0
1
SL0
0
1
x
SK
2 x t
c
4 x t
c
8 x t
c
Where t
c
is the instruction cycle clock
MICROWIRE/PLUS Slave Mode Operation
In the MICROWIRE/PLUS Slave mode of operation the SK
clock is generated by an external source. Setting the MSEL
bit in the CNTRL register enables the SO and SK functions
onto the G Port. The SK pin must be selected as an input
and the SO pin is selected as an output pin by setting and re-
setting the appropriate bit in the Port G configuration regis-
ter. Table 2 summarizes the settings required to enter the
Slave mode of operation.
The user must set the BUSY flag immediately upon entering
the Slave mode. This will ensure that all data bits sent by the
Master will be shifted properly. After eight clock pulses the
BUSY flag will be cleared and the sequence may be re-
peated.
Alternate SK Phase Operation
The device allows either the normal SK clock or an alternate
phase SK clock to shift data in and out of the SIO register. In
both the modes the SK is normally low. In the normal mode
data is shifted in on the rising edge of the SK clock and the
data is shifted out on the falling edge of the SK clock. The
SIO register is shifted on each falling edge of the SK clock in
the normal mode. In the alternate SK phase mode the SIO
register is shifted on the rising edge of the SK clock.
A control flag, SKSEL, allows either the normal SK clock or
the alternate SK clock to be selected. Resetting SKSEL
causes the MICROWIRE/PLUS logic to be clocked from the
normal SK signal. Setting the SKSEL flag selects the alter-
nate SK clock. The SKSEL is mapped into the G6 configura-
tion bit. The SKSEL flag will power up in the reset condition,
selecting the normal SK signal.
TABLE 11. MICROWIRE/PLUS Mode Selection
This table assumes that the control flag MSEL is set.
G4 (SO)
Config.
Bit
1
G5 (SK)
Config.
Bit
1
G4
Fun.
G5
Fun.
Operation
SO
Int.
SK
Int.
SK
Ext.
SK
Ext.
SK
MICROWIRE/PLUS
Master
MICROWIRE/PLUS
Master
MICROWIRE/PLUS
Slave
MICROWIRE/PLUS
Slave
0
1
TRI-
STATE
SO
1
0
0
0
TRI-
STATE
DS012067-38
FIGURE 39. MICROWIRE/PLUS Application
C
www.national.com
46
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