SX28ACSLASHDP datasheet(30/51 Pages) PARALLAX

30 / 51 page

Parallax SX20AC/SX28AC

www.parallax.com

Page 30 of 51

Rev 1.6 11/20/2006

14.0 REGISTER STATES UPON DIFFERENT RESET OPERATIONS

The effect of different reset operation on a register

depends on the register and the type of reset operation.

Some registers are initialized to specific values, some are

left unchanged, some are undefined, and some are

initialized to an unknown value. A register that starts with

an unknown value should be initialized by the software to

a known value; you cannot simply test the initial state and

rely on it starting in that state consistently. Table 14-1

lists the SX registers and shows the state of each register

upon different reset.

Table 14-1: Register States upon Different Resets

Power-On

Wakeup

Brown-Out

Watchdog Timer

MCLR

Undefined

Unchanged

Undefined

Unchanged

OPTION

FFh

MODE

0Fh

RTCC (01h)

Undefined

Unchanged

Undefined

Unchanged

PC (02h)

FFh

STATUS (03h)

Bits 0-2: undefined

Bits 3-4: 11

Bits 5-7: 000

Bits 0-2: unchanged

Bits 3-4: unchanged

Bits 5-7: 000

Bits 0-4: undefined

Bits 5-7: 000

Bits 0-2: unchanged

Bits 3-4: (Note 1)

Bits 5-7: 000

Bits 0-2: unchanged

Bits 3-4: (Note 2)

Bits 5-7: 000

FSR (04h)

Undefined

Bits 0-6: unchanged

Bit 7: 1

Bits 0-6: undefined

Bit 7: 1

Bits 0-6: unchanged

Bit 7: 1

Bits 0-6: unchanged

Bit 7: 1

RA/RB/RC Direction

FFh

RA/RB/RC Data

Undefined

Unchanged

Undefined

Unchanged

Other File Registers

SPRAM

Undefined

Unchanged

Undefined

Unchanged

CMP_B

Bits 0, 6-7: 1

Bits 1-5: undefined

Bits 0, 6-7: 1

Bits 1-5: undefined

Bits 0, 6-7: 1

Bits 1-5: undefined

Bits 0, 6-7: 1

Bits 1-5: undefined

Bits 0, 6-7: 1

Bits 1-5: undefined

WKPND_B

Undefined

Unchanged

Undefined

Unchanged

WKED_B

FFh

WKEN_B

FFh

ST_B/ST_C

FFh

LVL_A/LVL_B/LVL_C

FFh

PLP_A/PLP_B/PLP_C

FFh

Watchdog Counter

Undefined

Unchanged

Undefined

Unchanged

Note 1: Watchdog reset during Power Down mode: 00(TO, PD); during Active mode: 01 (TO, PD).

Note

External

reset

during

Power

Down

mode:

(TO,

PD);

during

Active

mode,

Unchanged

((TO,

PD)

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