參數(shù)資料
型號(hào)： 935263159551
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 16 MHz, MICROCONTROLLER, PQFP80
封裝： 14 X 20 X 2.70 MM, PLASTIC, QFP-80
文件頁(yè)數(shù)： 85/88頁(yè)
文件大?。?/td> 2520K
代理商： 935263159551
inoperative.The Power-down mode can be terminated by an external reset, by the seconds interrupt and by any one of the
two external interrupts.
The device also functions as an arithmetic processor having facilities for both binary and BCD arithmetic as well as bit-
handling capabilities. The instruction set of the P8xC557E8 is the same as the 80C51 and consists of over 100
instructions: 49 one-byte, 45 two-byte, and 17 three-byte. With a 16 MHz system clock, 58 pct of the instructions are
executed in 0.75 s and 40 pct in 1.5 s. Multiply and divide instructions require 3 s.
Electromagnetic Compatibility (EMC)
Primary attention is paid to the reduction of electromagnetic emission of the microcontroller P8xC557E8. The following
features reduce the electromagnetic emission and additionally improve the electromagnetic susceptibility:
l
Four digital part supply voltage pins (V
DD1 to VDD4) and four digital ground pins (VSS1 to VSS4) are placed as pairs of
V
DDn and VSSn at two adjacent pins, at each side of the package.
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Separated V
DD pins for the internal logic and the port buffers.
l
Internal decoupling capacitance improves the EMC radiation behaviour and the EMC immunity.
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External capacitors should be connected across associated V
DDn and VSSn pins (i.e. VDD1 and VSS1). Lead length
should be as short as possible. Ceramic chip capacitors are recommended (100 nF).
Recommendation on ALE
For applications that require no external memory or temporarily no external memory: the ALE output signal (pulses at a
frequency of 1/6 ×f
OSC) can be disabled under software control (bit RFI; SFR: PCON.5); if disabled, no ALE pulse will occur.
ALE pin will be pulled down internally, switching an external address latch to a quiet state. The MOVX instruction will still
toggle ALE (external Data Memory is accessed). ALE will retain its normal HIGH value during Idle mode and a LOW value
during Power-down mode while in the ‘RFI reduction mode’.
Additionally during internal access (EA = 1) ALE will toggle normally when the address exceeds the internal Program
Memory size. During external access (EA = 0) ALE will always toggle normally, whether the flag ‘RFI’ is set or not.
P8xC557Ex factsheet
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80C51 Central Processing Unit (CPU)
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64 kbytes ROM (only P83C557E8)
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64 kbytes EPROM (only P87C557E8)
Features
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