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参数资料
型号： ST72T141K2MARE
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO34
封装： 0.300 INCH, LEAD FREE, PLASTIC, SOP-34
文件页数： 64/131页
文件大小： 3096K
代理商： ST72T141K2MARE
ST72141K2-Auto
38/131
MISCELLANEOUS REGISTER (Cont’d)
7.5
MISCELLANEOUS
REGISTER
DESCRIPTION
MISCELLANEOUS REGISTER (MISCR)
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7 = XT16 MTC and SPI clock selection
This bit is set and cleared by software. The maxi-
mum allowed frequency is 4MHz.
0: MTC and SPI clock supplied with fOSC/2
1: MTC and SPI clock supplied with fOSC/4
Bit 6 = SSM SS mode selection
This bit is set and cleared by software.
0: Normal mode - the level of the SPI SS signal is
the external SS pin.
1: I/O mode, the level of the SPI SS signal is read
from the SSI bit.
Bit 5 = SSI SS internal mode
This bit replaces the SS pin of the SPI when the
SSM bit is set to 1. (see SPI description). It is set
and cleared by software.
Bits 4:3 = IS1[1:0] EI1 sensitivity
The interrupt sensitivity defined using the IS1[1:0]
bits combination is applied to the EI1 external in-
terrupts. These two bits can be written only when
the I bit of the CC register is set to 1 (interrupt
masked).
EI1: Port B
Bits 2:1 = IS0[1:0] EI0 sensitivity
The interrupt sensitivity defined using the IS0[1:0]
bits combination is applied to the EI1 external in-
terrupts. These two bits can be written only when
the I bit of the CC register is set to 1 (interrupt
masked).
EI0: Port A
Bit 0 = SMS Slow mode select
This bit is set and cleared by software.
0: Normal mode. fCPU = fOSC / 2
1: Slow mode. fCPU = fOSC / 32
See sections on low power consumption mode
and MCC for more details.
Table 9. Miscellaneous Register Map and Reset Values
7
0
XT16 SSM
SSI
IS11
IS10
IS01
IS00
SMS
IS11 IS10
External Interrupt Sensitivity
0
Falling edge & low level
0
1
Rising edge only
1
0
Falling edge only
1
Rising and falling edge
IS01 IS00
External Interrupt Sensitivity
0
Falling edge & low level
0
1
Rising edge only
1
0
Falling edge only
1
Rising and falling edge
Address
(Hex.)
Register
Label
7
6
5
4
3
2
1
0
0020h
MISCR
Reset Value
XT16
0
SSM
0
SSI
0
IS11
0
IS10
0
IS01
0
IS00
0
SMS
0
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