SPC11A Просмотр технического описания (PDF) - Unspecified

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SPC11A

12KB Sound Controller

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Preliminary

SPC11A

SLEEP

CPU CLK

RESET

Wake-up

T1

Tw

T1 = 1 / ( FCPU ), Tw ≧65536 x T1

FIG. 1

6.7. Low Voltage Reset

The SPC11A has a Low Voltage Reset (LVR) function. In general,

the CPU becomes unstable and malfunctions when the power

voltage drops below certain operating voltage. With the unique

design of Low Voltage Reset in SPC11A, it is able to reset all

functions to the initial operational (stable) state if the VDD

power-supply voltage drops below 1.3V or 2.7V (FIG.2).

T1

CPU CLK

VDD

1.3V/ 2.7V

RESET

T2

Tw

T2≧2 * T1

(The LVR function is the same as Power ON Reset or External Reset.)

FIG. 2

6.8. Timer/Counter

The SPC11A has two 12-bit timer/counters, TMA and TMB

respectively. TMA can be specified as a timer or a counter, but

TMB can only be used as a timer. In the timer mode, TMA and

TMB are re-loaded up-counters. When timer rollovers from

$0FFF to $0000, the carry (overflow) signal will make the user’s

preset value to be loaded into timer automatically and up-count

again. At the same time, the carry signal will generate an INT

signal if the corresponding bit is enabled in the INT ENABLE

Register. Suppose TMA is specified as a counter, users can

reset it by loading #0 into the counter. After the counter has been

activated, the value in the counter can also be read at the same

time. The read instruction will not affect the value of the counter

nor reset it.

Clock source of Timer/Counter can be selected as follows:

Timer/Counter

TMA

12-BIT TIMER

12-BIT COUNTER

TMB

12-BIT TIMER

MODE SELECT REGISTER

TIMER CLOCK SELECTOR

© Sunplus Technology Co., Ltd.

Proprietary & Confidential

Clock Source

CPU CLOCK (T) or T/4

T/64, T/8192, T/65536 or EXT CLK

T or T/4

TMA only, select timer or counter

Select T or T/4

6

JUL. 09, 2001

Preliminary Version: 0.1

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