MC68HC05X16 Datasheet, PDF(193/232 Page) Freescale Semiconductor, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

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MC68HC05X16 Datasheet, PDF (193/232 Pages) Freescale Semiconductor, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

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Freescale Semiconductor, Inc.

E6LAT â EPROM programming latch enable bit

1 (set) â Address and up to sixteen data bytes can be latched into the EPROM

for further programming providing the E6PGM bit is cleared.

0 (clear) â Data can be read from the EPROM or ï¬rmware ROM; the E6PGM bit

is cleared when E6LAT is â0â.

STOP, power-on and external reset clear the E6LAT bit.

Note:

After the tERA1 erase time or tPROG1 programming time, the E6LAT bit has to be reset

to zero in order to clear the E6PGM bit.

E6PGM â EPROM program enable bit

This bit is the EPROM program enable bit. It can be set to â1â to enable programming only after

E6LAT is set and at least one byte is written to the EPROM. It is not possible to clear this bit using

software but clearing E6LAT will always clear E6PGM.

Table B-2 EPROM control bits description

E6LAT

0

1

1

E6PGM

Description

0 Read/execute in EPROM

0 Ready to write address/data to EPROM

1 programming in progress

Note: The E6PGM bit can never be set while the E6LAT bit is at zero.

ECLK â External clock output

See Section 4.3.

E1ERA â EEPROM erase/programming bit

Providing the E1LAT and E1PGM bits are at logic one, this bit indicates whether the access to the

EEPROM is for erasing or programming purposes.

1 (set) â An erase operation will take place.

0 (clear) â A programming operation will take place.

Once the program/erase EEPROM address has been selected, E1ERA cannot be changed.

MC68HC05X16

MC68HC705X32

For More Information On This Product,

Go to: www.freescale.com

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