ST72F324J datasheet(149/156 Pages) STMICROELECTRONICS

149 / 156 page

ST72324J/K

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ST72324J/K DEVICE CONFIGURATION AND ORDERING INFORMATION (Cont’d)

OPTION BYTE 1

OPT7= PKG1

Pin package selection bit

This option bit selects the package.

Note: On the chip, each I/O port has 8 pads. Pads

that are not bonded to external pins are in input

pull-up configuration after reset. The configuration

of these pads must be kept at reset state to avoid

added current consumption.

OPT6 = RSTC

RESET clock cycle selection

This option bit selects the number of CPU cycles

applied during the RESET phase and when exiting

HALT mode. For resonator oscillators, it is advised

to select 4096 due to the long crystal stabilization

time.

0: Reset phase with 4096 CPU cycles

1: Reset phase with 256 CPU cycles

Note: when the CSS is enabled, the device starts

to count immediately thanks to the backup oscilla-

tor.

OPT5:4 = OSCTYPE[1:0]

Oscillator Type

These option bits select the ST7 main clock

source type.

OPT3:1 = OSCRANGE[2:0]

Oscillator range

When the resonator oscillator type is selected,

these option bits select the resonator oscillator

current source corresponding to the frequency

range of the used resonator. Otherwise, these bits

are used to select the normal operating frequency

range.

OPT0 = PLL OFF

PLL activation

This option bit activates the PLL which allows mul-

tiplication by two of the main input clock frequency.

The PLL must not be used with the internal RC os-

cillator. The PLL is guaranteed only with an input

frequency between 2 and 4MHz.

0: PLL x2 enabled

1: PLL x2 disabled

CAUTION: the PLL can be enabled only if the

“OSC RANGE” (OPT3:1) bits are configured to

“MP - 2~4MHz”. Otherwise, the device functionali-

ty is not guaranteed.

Version

Selected Package

PKG1

TQFP44 / SDIP42

TQFP32 / SDIP32

Clock Source

OSCTYPE

Resonator Oscillator

External RC Oscillator

Internal RC Oscillator

External Source

Typ. Freq. Range

OSCRANGE

1~2MHz

2~4MHz

4~8MHz

8~16MHz

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