Rainbow-electronics ATAR862-8 User Manual download pdf (Page 42)

ATAR862-8

4589B–4BMCU–02/03

Timer 1 Control Register 1

(T1C1)

Address: "7"hex - Subaddress: "8"hex

* Bit 3 -> MSB, Bit 0 -> LSB

The three bits T1C[2:0] select the divider for timer 1. The resulting time interval depends

on this divider and the timer 1 input clock source. The timer input can be supplied by the

system clock, the 32-kHz oscillator or via the clock management. If the clock manage-

ment generates the SUBCL, the selected input clock from the RC oscillator, 4-MHz

oscillator or an external clock is divided by 16.

Bit 3 * Bit 2 Bit 1 Bit 0

T1RM T1C2 T1C1 T1C0 Reset value: 1111b

T1RM Timer 1 Restart Mode T1RM = 0, write access without Timer 1 restart

T1RM = 1, write access with Timer 1 restart

Note: If WDL = 0, Timer 1 restart is impossible

T1C2 Timer 1 Control bit 2

T1C1 Timer 1 Control bit 1

T1C0 Timer 1 Control bit 0

T1C2 T1C1 T1C0 Divider

Time Interval with

SUBCL

Time Interval with

SUBCL = 32 kHz

Time Interval with

SYSCL = 2/1 MHz

0 0 0 2 SUBCL/2 61 µs 1 µs/2 µs

0 0 1 4 SUBCL/4 122 µs 2 µs/4 µs

0 1 0 8 SUBCL/8 244 µs 4 µs/8 µs

0 1 1 16 SUBCL/16 488 µs 8 µs/16 µs

1 0 0 32 SUBCL/32 0.977 ms 16 µs/32 µs

1 0 1 256 SUBCL/256 7.812 ms 128 µs/256 µs

1 1 0 2048 SUBCL/2048 62.5 ms 1024 µs/2048 µs

1 1 1 16384 SUBCL/16384 500 ms 8192 µs/16384 µs

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 105 106

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Rainbow-electronics ATAR862-8 User Manual Page 42