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General-Purpose Timer Registers

13.5.1.14 TAPR Register (Offset = 38h) [reset = X]

TAPR is shown in Figure 13-22 and described in Table 13-21.

Timer A Pre-scale This register allows software to extend the range of the timers when they are used

individually. When in one-shot or periodic down count modes, this register acts as a true prescaler for the

timer counter. When acting as a true prescaler, the prescaler counts down to 0 before the value in TAR

and TAV registers are incremented. In all other individual/split modes, this register is a linear extension of

the upper range of the timer counter, holding bits 23:16 in the 16-bit modes of the 16/32-bit GPT

Figure 13-22. TAPR Register

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

RESERVED TAPSR

R-X R/W-X

Table 13-21. TAPR Register Field Descriptions

Bit Field Type Reset Description

31-8 RESERVED R X

Software should not rely on the value of a reserved. Writing any

other value than the reset value may result in undefined behavior.

7-0 TAPSR R/W X

Timer A Pre-scale. Prescaler ratio in one-shot and periodic count

mode is TAPSR + 1, ie: 0: Prescaler ratio = 1 1: Prescaler ratio = 2

2: Prescaler ratio = 3 ... 255: Prescaler ratio = 256

1107

SWCU117A–February 2015–Revised March 2015 Timers

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