HC805K3GRSSLASHD datasheet(84/119 Pages) NXP

84 / 119 page

General Release Speciﬁcation

PEEPROM Registers

MC68HC805K3 — Rev. 1.0

Personality EEPROM

The charge pump must always be used to program or erase bits in the

Personality EEPROM. The CPEN bit is cleared when the device is in

reset.

NOTE:

Setting the CPEN bit can activate the charge pump. However, all the

PEPGM, PEBYTE, PEBULK, and CPEN bits must be cleared to de-

activate the charge pump. If the charge pump is left running, the overall

device IDD current increases.

PEBYTE — PEEPROM Byte Erase

The PEBYTE bit is a read/write bit to control the switches that apply

the internally provided charge pump programming voltage to a row in

the PEEPROM array that is to be erased. When the PEBYTE bit is set

to a logical one, a logical zero is stored to all bits in the same row of

the PEEPROM array, as specified by the upper four bits of the 7-bit

address in the PEBSR.

The PEBYTE bit should only be set if the PEPGM and PEBULK bits

are cleared. If both the PEBYTE and PEBULK bits are set, the

PEEPROM is bulk erased. The PEBYTE bit is cleared when the

device is reset.

PEPGM — PEEPROM Program Control

The PEPGM bit is a read/write bit to control the switches that apply

the internally provided charge pump programming voltage to the

device in the PEEPROM array that is to be programmed. When the

PEPGM bit is set to a logical one, a logical one is stored to the

PEEPROM array element specified by the address in the PEBSR.

Since the state of the PEPGM bit determines the state of the

programmed bit in the PEEPROM array, the PEPGM bit is similar to

a DATA IN bit.

The PEPGM bit should be set only if the PEBYTE and PEBULK bits

are cleared. The PEPGM bit is cleared when the device is reset.

NOTE:

Only one of the PEPGM, PEBYTE, or PEBULK bits should be set at any

one time.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC805K3GRS/D Datasheet(PDF) 84 Page - NXP Semiconductors