IC80C32 Datasheet, PDF (36/48 Pages) Integrated Circuit Solution Inc – CMOS SINGLE CHIP 8-BIT MICROCONTROLLER

IC80C52
IC80C32
Table 12. Status of the External Pins During Idle and Power-down Modes.
Mode
Idle
Idle
Power-down
Power-down
Memory
Internal
External
Internal
External
ALE PSEN PORT 0
1
1
Data
1
1
Float
0
0
Data
0
0
Float
PORT 1
Data
Data
Data
Data
PORT 2
Data
Address
Data
Data
PORT 3
Data
Data
Data
Data
On-Chip Oscillators
The on-chip oscillator circuitry of the IC80C54/58 is a single
stage inverter, intended for use as a crystal-controlled,
positive reactance oscillator. In this application the crystal is
operated in its fundamental response mode as an inductive
reactance in parallel resonance with capacitance external to
the crystal (Figure 24). Examples of how to drive the clock
with external oscillator are shown in Figure 25.
The crystal specifications and capacitance values (C1 and
C2 in Figure 24) are not critical. 20 pF to 30 pF can be used
in these positions at a 12 MHz to 24 MHz frequency with
good quality crystals. (For ranges greater than 24 MHz refer
to Figure 26.) A ceramic resonator can be used in place of
the crystal in cost-sensitive applications. When a ceramic
resonator is used, C1 and C2 are normally selected to be of
somewhat higher values. The manufacturer of the ceramic
resonator should be consulted for recommendation on the
values of these capacitors.
C2
XTAL2
C1
XTAL1
GND
Figure 24. Oscillator Connections
NC
EXTERNAL
OSCILLATOR
SIGNAL
XTAL2
XTAL1
GND
Figure 25. External Clock Drive Configuration
36
Integrated Circuit Solution Inc.
MC002-0B