ST92163R4D1L View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST92163R4D1L

8/16-BIT FULL SPEED USB MCU FOR COMPOSITE DEVICES WITH 16 ENDPOINTS, 20K ROM, 2K RAM, I2C, SCI, & MFT

STMicroelectronics 

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

Voltag e

Symbol range Min

Typ

Max Unit

4.0-5.5V 0.77

1.5

2.4

gm

mA/V

3.0-4.0V 0.5

0.73 1.47

Figure 42. Crystal Oscillator

CRYSTAL CLOCK

Table 17. Crystal Internal Resistance

Symbol Condition s C1=C2 C1=C2 C1=C2 C1=C2

= 56pF = 47pF = 33pF = 22pF

4.0-5.5V

Rsmax Freq.=8MHz

50 Ω

65Ω

120Ω 180Ω

(ohm)

3.0-4.0V

Freq.=8MHz

30 Ω

40Ω

70Ω 110Ω

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

HALT

CLOCK1

R

RIN

ROUT

ST9

OSCI N

OSCOUT

OSCIN

Figure 44. External Clock

OSCOUT

VR02086A

EXTERNAL CLOCK

CL1

CL2

1M*

*Recommended for oscillator stability VR02116A

ST9

OSCI N

OSC OUT

NC

CLOCK

INPU T

VR02116B

85/224

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