Maxim-integrated DS4830 Optical Microcontroller Manuel d'utilisateur télécharger pdf (Page 88)

DS4830 User’s Guide

10.2.5 – I

C Master Clock Control Register (I2CCK_M)

Address: M1[0Dh]

Bit

Name

I2CCKH7

I2CCKH6

I2CCKH5

I2CCKH4

I2CCKH3

I2CCKH2

I2CCKH1

I2CCKH0

I2CCKL7

I2CCKL6

I2CCKL5

I2CCKL4

I2CCKL3

I2CCKL2

I2CCKL1

I2CCKL0

Reset

Access

BIT

NAME

DESCRIPTION

15:8

I2CCKH[7:0]

C Clock High Period. These bits define the high period of the I

C clock. This period

is defined by the number of system clocks. The high time duration is calculated using the

following equation:

C High Time Period = System Clock Period x (I2CCKH[7:0] + 1)

I2CCKH[7:0] must be set to a minimum value of 2 to ensure proper operation. Any value

less than 2 will be set to 2.

7:0

I2CCKL[7:0]

C Clock Low Period. These bits define the low period of the I

C clock. This period is

defined by the number of system clocks. The low time duration is calculated using the

following equation:

C Low Time Period = System Clock Period x (I2CCKL[7:0] + 1)

I2CCKL[7:0] must be set to a minimum value of 4 to ensure proper operation. Any value

less than 4 will be set to 4.

10.2.6 – I

C Master Timeout Register (I2CTO_M)

Address: M1[0Eh]

Bit

Name

I2CTO7

I2CTO6

I2CTO5

I2CTO4

I2CTO3

I2CTO2

I2CTO1

I2CTO0

Reset

Access

The I2CTO_M register determines the length of the timeout interval. The timeout interval is defined by the number of I

C bit periods

(SCL high + SCL low). When cleared to 00h, the timeout function is disabled. When set to any other value, the I

C controller waits until

the timeout expires and sets the I2CTOI flag. The timeout period is:

C Timeout = I

C Bit Rate x (I2CTO[7:0] + 1)

The timeout timer resets to 0 and starts to count after each of the following events.

 The I2CSTART bit is set.

 The I2CSTOP bit is set.

 Any time that SCL goes low.

10.2.7 – I

C Master Address Register (I2CSLA_M)

Address: M1[0Fh]

Bit

Name

I2CMODE

Reset

Access

This register has no function when operating in master mode.

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 226 227

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Maxim-integrated DS4830 Optical Microcontroller Manuel d'utilisateur Page 88

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