ST92163 datasheet(85/224 Pages) STMICROELECTRONICS

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ST92163 - RESET AND CLOCK CONTROL UNIT (RCCU)

5.5 OSCILLATOR CHARACTERISTICS

The oscillator circuit uses an inverting gate circuit

with tri-state output.

Notes:

Owing to the Q factor required, Ceramic

Resonators may not provide a reliable oscillator

source.

OSCOUT must not be directly used to drive exter-

nal circuits.

When the oscillator is stopped, OSCOUT goes

high impedance.

In Halt mode, set by means of the HALT instruc-

tion, the parallel resistor, R, is disconnected and

the oscillator is disabled, forcing the internal clock,

CLOCK1, to a high level, and OSCOUT to a high

impedance state.

To exit the HALT condition and restart the oscilla-

tor, an external RESET pulse is required.

It should be noted that, if the Watchdog function is

enabled, a HALT instruction will not disable the os-

cillator. This to avoid stopping the Watchdog if a

HALT

code is executed in error. When this occurs,

the CPU will be reset when the Watchdog times

out or when an external reset is applied.

Table 16. Oscillator Transconductance

Figure 42. Crystal Oscillator

Table 17. Crystal Internal Resistance

Legend:

C1,C2: Maximum Total Capacitances on pins OSCIN and

OSCOUT (the value includes the external capacitance

tied to the pin CL1 and CL2 plus the parasitic capacitance

of the board and of the device).

Rsmax: The equivalent serial resistor of the crystal.

Note 1: The tables are relative to the fundamental quartz

crystal only (not ceramic resonator).

Note 2: To reduce the parasitic capacitance, it is recom-

mended to place the crystal as close to the ST9 MCU as

possible.

WARNING: At low temperature, frost and humidity might

prevent the correct start-up of the oscillator.

Figure 43. Internal Oscillator Schematic

Figure 44. External Clock

Symbol

Voltage

range

Min

Typ

Max

Unit

4.0-5.5V

0.77

1.5

2.4

mA/V

3.0-4.0V

0.5

0.73

1.47

OSCIN

OSCOUT

CL1

CL2

ST9

CRYSTAL CLOCK

VR02116A

1M*

*Recommended for oscillator stability

Symbol Condition s C1=C2

= 56pF

C1=C2

=47pF

C1=C2

= 33pF

C1=C2

= 22pF

Rsmax

(ohm)

4.0-5.5V

Freq.=8MHz

Ω

120

Ω

180

Ω

3.0-4.0V

Freq.=8MHz

Ω

110

Ω

VR02086A

HALT

OSCIN

OSCOUT

RIN

ROUT

CLOCK1

OSCIN

OSCOUT

CLOCK

INPUT

EXTERNAL CLOCK

VR02116B

ST9

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