Samsung 8-Bit Instrukcja Użytkownika Pobierz pdf (Strona 398)

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101

BASIC TIMER S3C9228/P9228 (Preliminary Spec)

10-2

BASIC TIMER CONTROL REGISTER (BTCON)

The basic timer control register, BTCON, is used to select the input clock frequency, to clear the basic timer

counter and frequency dividers, and to enable or disable the watchdog timer function. It is located in page 0,

address DCH, and is read/write addressable using Register addressing mode.

A reset clears BTCON to "00H". This enables the watchdog function and selects a basic timer clock frequency of

fxx/4096. To disable the watchdog function, you must write the signature code “1010B” to the basic timer register

control bits BTCON.7–BTCON.4.

The 8-bit basic timer counter, BTCNT (page 0, DDH), can be cleared at any time during normal operation by

writing a "1" to BTCON.1. To clear the frequency dividers for the basic timer input clock and timer counters, you

write a "1" to BTCON.0.

Basic TImer Control Register (BTCON)

DCH, R/W

.7 .6 .5 .4 .3 .2 .1 .0MSB LSB

Divider clear bit for basic timer

and timer counters:

0 = No effect

1 = Clear divider

Basic timer counter clear bit:

0 = No effect

1 = Clear BTCNT

Basic timer input clock selection bits:

00 = fXX/4096

01 = fXX/1024

10 = fXX/128

11 = fXX/16

Watchdog function enable bits:

1010B

Other Value

= Disable watchdog timer

= Enable watchdog timer

Figure 10-1. Basic Timer Control Register (BTCON)

1 2 ... 393 394 395 396 397 398 399 400 401 402 403 ... 461 462

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