8051 單晶片硬體设计-LCD-KEY-PAD 20 } C (2) Vc c : (1) (2) q ± } C XTAL1 ¤ XTAL2 : (1) 19 } ¤ 18 } C 40 } C q¤§aqì}C
¨}¤§±¤@- (3) (4) ° ±`¤§-^é 12MHZC 4-3 1
3.5 12MHZ
¤§-^éC
3.58MHZB 6MHZB 1 .0592MHZ
18 XTAL2
89C51
X1 19
XTAL1 GND
C1
C2
20
C1,2 = 20 10PF
4-3 1 RES T : (1) (2) 9 }C-mé¤J}C } ¤ ¤ w ¤ @ - 50 ó [ a A H u ± ¤ @ - q e }÷-m\àC (3) p A -i n b q e ¨ ¨ p ¤ @ - ± ` } A s HKsi±j-¨t-mC (4) (5) ° í-mHoá|¤UC§@G a. - m S í \ à s - C b. ° c. O CPU ±q ì §} 0 0H (Port1A Port3) 4-3 2C
úq
30 ó [ q ± +VC C § Y i b q ON
¨°é¤JAC }l°{ C
¨t]-pú
6-1 ¨ t ] - p ú
± M D ¤ A D - n ± N m d ¤ ÷ ± ± K X ê H q ¤ l q ¨ ê { LC§Q X C m d……
