參數(shù)資料
型號(hào)： MC80C52XXX-36/883
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CDIP40
封裝： 0.600 INCH, SIDE BRAZED, DIP-40
文件頁(yè)數(shù)： 17/20頁(yè)
文件大?。?/td> 194K
代理商： MC80C52XXX-36/883
80C32/80C52/80C32E
6
Rev. J
– July 03, 2000
5. Idle And Power Down Operation
Figure 3. shows the internal Idle and Power Down clock configuration. As illustrated, Power Down operation stops
the oscillator. Idle mode operation allows the interrupt, serial port, and timer blocks to continue to function, while the
clock to the CPU is gated off.
These special modes are activated by software via the Special Function Register, PCON. Its hardware address is 87H.
PCON is not bit addressable.
Figure 3. Idle and Power Down Hardware
PCON: Power Control Register
(MSB)
(LSB)
765432
10
SMOD
–
GF1
GF0
PD
IDL
Symbol
Position
Name and Function
SMOD
PCON.7
Double Baud rate bit
When set to a 1, the baud rate is doubled when the serial port is being used in either modes 1, 2 or 3.
–
PCON.6
Reserved
The value read from this bit is indeterminate. Do not set this bit.
–
PCON.5
Reserved
The value read from this bit is indeterminate. Do not set this bit.
–
PCON.4
Reserved
The value read from this bit is indeterminate. Do not set this bit.
GF1
PCON.3
General–purpose flag bit
GF0
PCON.2
General–purpose flag bit
PD(1)
PCON.1
Power Down bit. Setting this bit activates power down operation
Cleared by hardware when an interrupt or reset occurs.
Set to activate the Power–Down mode.
If IDL and PD are both set, PD takes precedence.
IDL(1)
PCON.0
Idle mode bit
Cleared by hardware when an interrupt or reset occurs.
Set to activate the Idle mode.
If IDL and PD are both set, PD takes precedence.
1.
If 1’s are written to PD and IDL at the same time. PD takes, precedence. The reset value of PCON is (000X0000).
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