ST72324BL datasheet(140/151 Pages) STMICROELECTRONICS

140 / 151 page

ST72F324L, ST72324BL

140/151

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

OPT5:4 = OSCTYPE[1:0] Oscillator Type

These option bits select the ST7 main clock

source type.

CAUTION: In Flash devices, External Clock

Source is not supported if the PLL is enabled.

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 is guaranteed only with an input frequen-

cy 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 functionality is

not guaranteed.

Caution: The PLL must not be used with the inter-

nal RC oscillator.

Version

Selected Package

PKG1

JTQFP44

TQFP32 / SDIP32

Clock Source

OSCTYPE

Resonator Oscillator

Reserved

Internal RC Oscillator

External Source

Typ. Freq. Range

OSCRANGE

210

1~2MHz

2~4MHz

4~8MHz

8~16MHz

ST72324BL Datasheet(PDF) 140 Page - STMicroelectronics

ST72324BL Datasheet(HTML) 140 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL