Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Manual de usuario descargar pdf (Pagina 50)

Timer 2 Example: Triggering a Periodic Interrupt

move PD0, #0FFh ; Set P0.0-P0.7 to output mode

move PO0, #000h ; Drive low on all Port 0 pins

move IV, #IntHandler ; Set address for interrupt handler

move IMR.3, #1 ; Enable interrupts for module 3

move T2CFG0, #070h ; 16-bit timer mode, system clock / 128

move T2V0, #0CCCCh ; Period = (10000h-0CCCCh)*128 / Clock

move T2CNA0.3, #1 ; Start timer 0

move T2CNA0.7, #1 ; Enable timer 0 interrupts

move IC, #1 ; Enable global interrupts

jump $

IntHandler:

move T2CNB0, #00h ; Clear interrupt flags

move T2V0, #0CCCCh ; Reset for the same period

move Acc, PO0 ; Get current Port 0 output

cpl ; Toggle all bits

move PO0, Acc ; Set new Port 0 output

reti

MAXQ Family User’s Guide:

MAXQ2000 Supplement

T2V1 M4[09h]

Timer/Counter 1 (Type 2) Value Register

T2H1 M4[01h] Timer/Counter 1 (Type 2) Value MSB Register. Provides access to high byte of T2V.

T2R1 M4[0Ah]

Timer/Counter 1 (Type 2) Reload Register

T2RH1 M4[02h]

Timer/Counter 1 (Type 2) Reload MSB Register. Provides access to high byte of T2R.

T2C1 M4[0Bh]

Timer/Counter 1 (Type 2) Capture/Compare Register

T2CH1 M4[03h]

Timer/Counter 1 (Type 2) Capture/Compare MSB Register. Access to high byte of T2C.

T2CFG2 M4[11h]

Timer/Counter 2 (Type 2) Configuration Register. Controls counter/timer select, capture/compare function

select, 8-bit/16-bit mode select, and clock divide modes.

T2CNA2 M4[04h] Timer/Counter 2 (Type 2) Control Register A. I/O settings, run enables, polarity modes.

T2CNB2 M4[0Ch]

Timer/Counter 2 (Type 2) Control Register B. Contains capture, compare, overflow flags.

T2V2 M4[0Dh]

Timer/Counter 2 (Type 2) Value Register

T2H2 M4[05h]

Timer/Counter 2 (Type 2) Value MSB Register. Provides access to high byte of T2V.

T2R2 M4[0Eh]

Timer/Counter 2 (Type 2) Reload Register

T2RH2 M4[06h]

Timer/Counter 2 (Type 2) Reload MSB Register. Provides access to high byte of T2R.

T2C2 M4[0Fh]

Timer/Counter 2 (Type 2) Capture/Compare Register

T2CH2 M4[07h] Timer/Counter 2 (Type 2) Capture/Compare MSB Register. Access to high byte of T2C.

Table 14. Type 2 Timer/Counter Control Registers (continued)

Maxim Integrated

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 92 93

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