COP8SA-DM National Semiconductor, COP8SA-DM Datasheet - Page 57

• Manufacturer Part Number: COP8SA-DM
• Description: MODULE DEBUGGING FOR COP8SA
• Manufacturer: National Semiconductor

Specifications of COP8SA-DM

• Module/board Type: Debugger Module
• For Use With/related Products: Cop 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *COP8SA-DM

There are four clock oscillator options available: Crystal Oscillator with or without on
chip bias resistor, R/C Oscillator with on-chip resistor and capacitor, and External
Oscillator. The oscillator feature is selected by programming the ECON register, which
is summarized in Table 2-2.
Crystal Oscillator
The Crystal Oscillator mode can be selected by programming ECON Bit 4 to 1. CKI is the
clock input while G7/CKO is the clock generator output to the crystal. An on-chip bias
resistor connected between CKI and CKO can be enabled by programming ECON Bit 3
to 1 with the crystal oscillator option selection. The value of the resistor is in the range
of 0.5 M to 2M (typically 1.0 M). Table 2-3 shows the component values required for
various standard crystal values. Resistor R2 is only used when the on-chip bias resistor
is disabled. Figure 2-12 shows the crystal oscillator connection diagram.
Table 2-3 Crystal Oscillator Configuration, T
WITH ON-CHIP BIAS RESISTOR
ECON4
R1 (k
0
1
0
1
5.6
0
0
0
C2
ECON3
) R2 (M
0
0
1
1
Figure 2-12 Crystal Oscillator
Table 2-2 Oscillator Option
C1
R1
1
1
1
1
External Oscillator
Crystal Oscillator without bias resistor
R/C Oscillator
Crystal Oscillator with bias resistor
) C1 (pF) C2 (pF)
100
30
32
45
Oscillator Option
WITHOUT ON-CHIP BIAS RESISTOR
100-156
30–36
COP8SAx7 MICROCONTROLLER
30
32
C2
A
= 25˚C, V
CKI Freq
(MHz)
0.455
15
10
4
C1
R1
CC
= 5V
2-19