Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Manual de usuario descargar pdf (Pagina 86)

MAXQ Family User’s Guide:

MAXQ8913 Supplement

21-11

21.2.8 EXENB Control During PWM/Output Control Mode

The TB0B input function (EXENB = 1) and the PWM/output control function (TBCS:TBCR<>00b) can be enabled at

the same time. However, the input function changes slightly when this is done. In this configuration, the detection of a

falling edge on the TB0B pin results in setting of the EXFB interrupt flag, but does not force an autoreload.

21.3 Timer B Examples

21.3.1 Timer B Example: Reloading Timer Mode

move PD5.2, #1 ; Set P5.2 to output mode

move PO5.2, #1 ; Drive high (LED off)

move TBCN, #0000010000000000b ; Timer mode, reload mode, clock/256

move TBR, #8000h ; Reload every 8000h timer cycles

move TBCN.2, #1 ; Start timer

;; Reload time is 1/sysclk * 256 * 8000h == 838ms

timerLoop:

move C, TBCN.7 ; Check reload flag

jump NC, timerLoop

move TBCN.7, #0 ; Clear reload flag

move Acc, PO5

xor #0100b ; Toggle bit 2

move PO5, Acc

jump timerLoop

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Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Manual de usuario Pagina 86