SX28ACSLASHDP datasheet(16/51 Pages) PARALLAX

16 / 51 page

Parallax SX20AC/SX28AC

www.parallax.com

Page 16 of 51

Rev 1.6 11/20/2006

5.2.

FUSEX Word (Read/Program via Programming Command)

IRCTRIM2

PINS

IRCTRIM1

IRCTRIM0

OPTIONX

STACKX

BOR1

BOR0

BORTR1

BORTR0

BP1

BP0

Bit 11

Bit 0

IRCTRIM2:

Internal RC oscillator trim bits. This 3-bit field adjusts the operation of the internal RC oscillator to make it

operate within the target frequency range 4 MHz plus or minus 8%. Parts are shipped from the factory

untrimmed. The device relies on the programming to0l to provide the trimming function.

000b = minimum frequency

111b = maximum frequency

each step about 3%

PINS

Selects the number of pins.

0 = 18/20 pins

1 = 28 pins

OPTIONX

OPTION Register Extension and Stack Extension. Set to 1 to disable the programmability of bit 6 and bit 7

in the OPTION register, the RTW and RTE_IE bits (in other words, to force these two bits to 1) and to

limit the program stack size to two locations. Clear to 0 to enable programming of the RTW and RTE_IE

bits in the OPTION register, and to extend the stack size to eight locations.

Active low - makes carry bit input to ADD and SUB instructions.

BOR1: BOR0

Brown-Out Reset: These bits enable or disable the brown-out reset function and set the brown-out threshold

voltage as follows:

00b = 4.2 V

01b = 2.6 V

10b = 2.2 V

11b = Brown-Out disabled

BORTR1:

Brown-Out trim bits (parts are shipped out of factory untrimmed).

BORTR0

01b = minimum threshold voltage

00b = LOW

11b = HIGH

10b = maximum threshold voltage

BP1:BPO

00b = 1 page, 1 bank

01b = 2 pages, 1 bank

10b = 4 pages, 4 banks

11b = 4 pages, 8 banks

(default configuration)

5.3.

DEVICE Word (Hard-Wired Read-Only)

Bit 11

Bit 0

STACKX

IRCTRIM

SX28AC/DP Datasheet(PDF) 16 Page - Parallax Inc

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