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參數(shù)資料
| 型號： | SD80C32XXX-36/883 |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 36 MHz, MICROCONTROLLER, CDIP40 |
| 封裝： | 0.600 INCH, CERAMIC, DIP-40 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大小： | 194K |
| 代理商： | SD80C32XXX-36/883 |
80C32/80C52/80C32E
7
Rev. J
– July 03, 2000
5.1. Idle Mode
The instruction that sets PCON.0 is the last instruction executed before the Idle mode is activated. Once in the Idle
mode the CPU status is preserved in its entirety: the Stack Pointer, Program Counter, Program Status Word,
Accumulator, RAM and all other registers maintain their data during idle. Table 1. describes the status of the external
pins during Idle mode.
There are three ways to terminate the Idle mode. Activation of any enabled interrupt will cause PCON.0 to be cleared
by hardware, terminating Idle mode. The interrupt is serviced, and following RETI, the next instruction to be executed
will be the one following the instruction that wrote 1 to PCON.0.
The flag bits GF0 and GF1 may be used to determine whether the interrupt was received during normal execution or
during the Idle mode. For example, the instruction that writes to PCON.0 can also set or clear one or both flag bits.
When Idle mode is terminated by an enabled interrupt, the service routine can examine the status of the flag bits.
The second way of terminating the Idle mode is with a hardware reset. Since the oscillator is still running, the hardware
reset needs to be active for only 2 machine cycles (24 oscillator periods) to complete the reset operation.
5.2. Power Down Mode
The instruction that sets PCON.1 is the last executed prior to entering power down. Once in power down, the oscillator
is stopped. The contents of the onchip RAM and the Special Function Register is saved during power down mode. The
hardware reset initiates the Special Fucntion Register. In the Power Down mode, VCC may be lowered to minimize
circuit power consumption. Care must be taken to ensure the voltage is not reduced until the power down mode is
entered, and that the voltage is restored before the hardware reset is applied which freezes the oscillator. Reset should
not be released until the oscillator has restarted and stabilized.
Table 1. describes the status of the external pins while in the power down mode. It should be noted that if the power
down mode is activated while in external program memory, the port data that is held in the Special Function Register
P2 is restored to Port 2. If the data is a 1, the port pin is held high during the power down mode by the strong pullup,
T1, shown in Figure 4.
Table 1. Status of the external pins during idle and power down modes
Mode
Program Memory
Ale
PSEN
PORT0
PORT1
PORT2
PORT3
Idle
Internal
1
Port Data
Idle
External
1
Floating
Port Data
Address
Port Data
Power Down
Internal
0
Port Data
Power Down
External
0
Floating
Port Data
5.3. Stop Clock Mode
Due to static design, the TEMIC 80C32/C52 clock speed can be reduced until 0 MHz without any data loss in memory
or registers. This mode allows step by step utilization, and permits to reduce system power consumption by bringing
the clock frequency down to any value. At 0 MHz, the power consumption is the same as in the Power Down Mode.
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