Maxim-integrated MAXQ7667 Manual do Utilizador descarregar pdf (Página 102)

___________________________________________________________________________________________________________ 6-8

MAXQ7667 User’s Guide

6.3 Type 2 Status/Control Registers

6.3.1 Type 2 Timer/Counter Configuration Register (T2CFGx)

egister Description:

ype 2 Timer/Counter Configuration Register

egister Address:

T2CFG0:

Module 02h, Index 10h

T2CFG1: Module 02h, Index 11h

T2CFG2: Module 03h, Index 10h

Bits 15 to 8: Reserved.

Read 0, write ignored.

Bit 7: Type 2 Timer Clock Input Select Bit (T2CI). Setting this bit enables an alternate input clock source to the Type 2 timer block.

The alternate input clock selection is the 32kHz clock. The alternate input clock must be sampled by the system clock, which requires

that the system clock be at least 4 x 32kHz for proper operation unless the system clock is also source from the 32kHz crystal.

Bits 6 to 4: Type 2 Timer Clock Divide Bits 2:0 (T2DIV[2:0]). These three bits select the divide ratio for the timer clock input clock

(as a function of the system clock) when operating in timer mode with T2CI = 0.

Bit 3: Type 2 Timer Mode Select (T2MD). This bit enables the dual 8-bit mode of operation. The default reset state is 0, which selects

the 16-bit mode of operation. When the dual 8-bit mode is established, the primar

y timer/counter (T2Hx) car

ries all the counter/cap-

ture functionality, while the secondary 8-bit timer (T2Lx) must operate in timer compare mode, sourcing the defined internal clock.

0 = 16-bit mode (default)

1 = dual 8-bit mode

it #

5 14 13 12 11 10 98

Name — — — — — — — —

Reset 0 0 0 0 0 0 0 0

Access r r r r r r r r

Bit #

76543210

Name T2CI T2DIV2 T2DIV1 T2DIV0 T2MD CCF1 CCF0 C/T2

Reset 0 0 0 0 0 0 0 0

Access rw rw rw rw rw rw rw rw

r = read, w = write

T2DIV[2:0] D IVIDE RATIO

0 0 0 1

0 0 1 2

0 1 0 4

0 1 1 8

1 0 0 16

1 0 1 32

1 1 0 64

1 1 1 128

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 346 347

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