ST72621L4M1(2002) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72621L4M1
(Rev.:2002)

LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS, FLASH OR ROM MEMORY, LVD, WDG, 10-BIT ADC, 2 TIMERS, SCI, SPI

STMicroelectronics 

ST7262

14 DEVICE CONFIGURATION AND ORDERING INFORMATION

Each device is available for production in ROM

versions and in user programmable versions

(FLASH) as well as in factory coded versions

(FASTROM).

FLASH devices are shipped to customers with a

default content (FFh), while FASTROM factory

coded parts contain the code supplied by the cus-

tomer. This implies that FLASH devices have to be

configured by the customer using the Option Byte

while the ROM devices are factory-configured.

The FASTROM or ROM contents are to be sent on

diskette, or by electronic means, with the hexadec-

imal file in .S19 format generated by the develop-

ment tool. All unused bytes must be set to FFh.

The selected options are communicated to STMi-

croelectronics using the correctly completed OP-

TION LIST appended.

The STMicroelectronics Sales Organization will be

pleased to provide detailed information on con-

tractual points.

14.1 OPTION BYTE

The Option Byte allows the hardware configuration

of the microcontroller to be selected.

The Option Byte has no address in the memory

map and can be accessed only in programming

mode using a standard ST7 programming tool.

The default content of the FLASH is fixed to FFh.

This means that all the options have “1” as their

default value.

In FASTROM devices, the Option Byte is fixed in

hardware by the FASTROM code.

7

0

Bit 4 = NEST

This option bit selects the nested interrupts fea-

ture.

0: Nested interrupt feature disabled

1: Nested interrupt feature enabled

Bit 3 = LVD Low Voltage Detector selection

This option bit selects the LVD.

0: LVD enabled

1: LVD disabled

Note: The LVD must be disabled in low voltage

devices.

Bit 2= Reserved.

Bit 1 = OSC12/6 Oscillator selection

This option bit selects the clock divider used to

drive the USB interface at 6MHz.

0: 6 MHz oscillator (no divider for USB)

1: 12 Mhz oscillator (2 divider for USB)

Note: The 6 MHz oscillator is mandatory in low

voltage devices.

Bit 0 = FMP_R Memory Readout Protection

This option bit allows the protection of the software

contents against piracy (program or data). When

the protection is activated, read/write access is

prevented by hardware. If the protection is deacti-

vated, the memory is erased first.

0: Read-out protection enabled

1: Read-out protection disabled

-

-

WDG

SW

NEST

LVD

-

OSC FMP_

12/6 R

Bits 7:6 = Reserved.

Bit 5 = WDGSW Hardware or software watchdog

This option bit selects the watchdog type.

0: Hardware enabled

1: Software enabled

127/133

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