VSC056 datasheet(96/134 Pages) MAXIM

96 / 134 page

96 of 134

VSC056

Data Sheet

Revision 4.1

January 2008

3.2.85 CEh: General-Purpose Timer Count 2 (GPTC2)

The following table shows the bit assignments for the General-Purpose Timer Count 2 register.

3.2.86 CFh: General-Purpose Timer Enable (GPTE)

The following table shows the bit assignments for the General-Purpose Timer Enable register.

GPTC2

Address:

CEh

Reset Value:

0000_0000b

Bit

Bit Label

Access

Description

7:0

TC23-16

R/W

Timer Count

These eight bits are part of the 24-bit general-purpose timer down counter

initial count value.

Writing to this register causes the timer to update and initiate a countdown from

the new value if the timer has been enabled in the GPTE register.

Clearing this register, along with the GPTC0 and GPTC1 registers, stops the

down counter and disables the interrupt generation logic.

After a reset or power on, these bits are cleared.

GPTE

Address:

CFh

Reset Value:

0000_0000b

Bit

Bit Label

Access

Description

7:1

RES

Reserved.

GPTE

R/W

General-Purpose Timer Enable

This bit enables the general-purpose timer to down count and generate an

interrupt when the timer reaches zero. The general-purpose timer down counts

using a clock source that is a divide-by-three of the core clock (8.0 MHz to

12.5 MHz), resulting in a timer count resolution of 375 ns to 240 ns.

When the timer initial count is set to all 1s, the maximum timeout is greater

than four seconds when using a 12.5 MHz core clock.

When the 24-bit timer reaches a value of zero, the interrupt output of the

VSC056 is asserted. The timer then re-loads with the initial count value found

in the GPTC0, GPTC1, and GPTC2 registers and begins counting down again.

Writing a value of FFh to the BCIS register clears this interrupt.

After a reset or power on, this bit is cleared, disabling the timer and timer

interrupt.

VSC056 Datasheet(PDF) 96 Page - Maxim Integrated Products

VSC056 Datasheet(HTML) 96 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL