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参数资料
型号： ST72C171K2B6
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装： SHRINK, PLASTIC, DIP-32
文件页数： 83/152页
文件大小： 2156K
代理商： ST72C171K2B6
ST72C171
36/152
7.2 MISCELLANEOUS REGISTERS
7.2.1 Miscellaneous Register 1 (MISCR1)
Miscellaneous register 1 is used select SLOW op-
erating mode. Bits 3, 4, 6, and 7 determine the po-
larity of external interrupt requests.
Register Address: 0020h
—
Read/Write
Reset Value: 0000 0000 (00h)
Bit 7:6 = PEI[3:2] Polarity Options of External In-
terrupt ei1. (Port B).
These bits are set and cleared by software. These
bits determine which event causes the external in-
terrupt (ei1) on port B according to Table 8.
Table 8. ei1 Ext. Int. Polarity Options
Bit 5 = MCO Main clock out selection
This bit enables the MCO alternate function on the
I/O port. It is set and cleared by software.
0: MCO alternate function disabled
(I/O pin free for general-purpose I/O)
1: MCO alternate function enabled
(fOSC/2 on I/O port)
This bit is set and cleared by software. When set it
can be used to output the internal clock to the ded-
icated I/O port.
Bit 4:3 = PEI[1:0] Polarity Options of External In-
terrupt ei0. (Port A)
These bits determine which event causes the ex-
ternal interrupt (ei0) on port A according to Table
9.
Table 9. ei0 Ext. Int. Polarity Options
Bit 2:1 = CP[1:0] CPU clock prescaler
These bits are set and cleared by software. They
determine the CPU clock when the SMS bit is set
according to the following table.
Table 10. fCPU Value in Slow Mode
Bit 0 = SMS Slow Mode Select
This bit is set and cleared by software.
0: Normal Mode - fCPU = fOSC/ 2
1: Slow Mode - the fCPU value is determined by the
PC[1:0] bits.
70
PEI3
PEI2
MCO PEI1 PEI0 CP1
CP0
SMS
MODE
PEI3
PEI2
Falling edge and low level
(Reset state)
00
Rising edge only
0
1
Falling edge only
1
0
Rising and falling edge
1
MODE
PEI1
PEI0
Falling edge and low level
(Reset state)
00
Rising edge only
0
1
Falling edge only
1
0
Rising and falling edge
1
fCPU Value
CP1
CP0
fOSC / 4
0
fOSC / 8
1
0
fOSC / 16
0
1
fOSC / 32
1
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相关代理商/技术参数
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