IA6805E2
29 August 2007
Microprocessor Unit
As of Production Version 00
Crystal Parameters Representative Frequencies:
5.0 MHz 4.0 MHz 1.0 MHz
50Ω
8 pF
75Ω
7 pF
400Ω
5 pF
RS max
C0
C1
Q
0.02 pF
50 k
0.012 pF
40 k
0.008 pF
30 k
COSC1
COSC2
15-30 pF
15-25 pF
15-30 pF
15-25 pF
15-40 pF
15-30 pF
Oscillator Connections:
CRYSTAL CIRCUIT
CRYSTAL OSCILLATOR CONNECTIONS
ia6805E2
L
OSC1
OSC2
C1
RS
39
38
NC
38
39
10 MΩ
C0
OSC2
OSC1
38
OSC2
39
OSC1
IA6805E2
38
39
C
C
OSC1
OSC2
OSC2
OSC1
tOH
tOL
OSC1 PIN
t
tOLOL
Figure 3. OSC1, OSC2 (System Clock)
OSC1 to Bus Transitions Timing Waveforms:
OSC1
AS
DS
RW_n
A[12:8]
MPU
READ
DATA*
B[7:0]
MUX ADDR
MPU READ
B[7:0]
MUX ADDR
MPU WRITE DATA
MPU WRITE
*READ DATA "LATCHED" ON DS FALL
Figure 4. OSC1, OSC2 (System Clock)
Copyright © 2007
IA211081401-03
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