MAXQ612/MAXQ622 User’s Guide
11-12 Maxim Integrated
11.4.5 I
2
C Clock Control Register (I2CCK)
Bits 15 to 8: I
2
C Clock High (I2CCKH[7:0]). These bits define the I
2
C SCL high period in number of system clock, with
bit 7 as the most significant bit. The duration of SCL high time is calculated using the following equation:
I
2
C High Time Period = System Clock x (I2CCKH[7:0] + 1)
When operating in master mode, the I2CCKH must be set to a minimum value of 2 to ensure proper operation. Any
value less than 2 is set to 2.
Bits 7 to 0: I
2
C Clock Low (I2CCKL[7:0]. These bits define the I
2
C SCL low period in number of system clock, with
bit 7 as the most significant bit. The duration of SCL low time is calculated using the following equation:
I
2
C Low Time Period = System Clock x (I2CCKL[7:0] + 1)
When operating in master mode, the I2CCKL must be set to a minimum value of 4 to ensure proper operation. Any
value less than 4 is set to 4.
11.4.6 I
2
C Timeout Register (I2CTO)
Bits 7 to 0: I
2
C Timeout Register (I2CTO[7:0]). This register is used only in master mode. This register determines
the number of I
2
C Bit Period (SCL High + SCL Low) the I
2
C master waits for SCL to go high. The timeout timer resets
to 0 and starts to count after the I2CSTART bit is set or every time the SCL goes low. When cleared to 00h, the time-
out function is disabled and the I
2
C waits for SCL to go high indefinitely during a transmission. When set to any other
values, the I
2
C waits until the timeout expires and sets the I2CTOI flag.
I
2
C Timeout = I
2
C Bit Rate x (I2CTO[7:0] + 1)
Note that these bits have no effect when the I
2
C module is operating in slave mode (I2CMST = 0). When operating in
slave mode, SCL is controlled by an external master.
Note 1: Writes to this register are ignored when I2CBUSY = 0.
Note 2: This register has no function in slave mode.
Register Name
I2CCK
Register Description
I
2
C Clock Control Register
Register Address
M4[08h]
Register Name
I2CTO
Register Description
I
2
C Timeout Register
Register Address
M4[09h]
Bit # 15 14 13 12 11 10 9 8
Name I2CCKH[7:0]
Reset 0 0 0 0 0 0 1 0
Access rw rw rw rw rw rw rw rw
Bit # 7 6 5 4 3 2 1 0
Name I2CCKL[7:0]
Reset 0 0 0 0 0 1 0 0
Access rw rw rw rw rw rw rw rw
Bit # 7 6 5 4 3 2 1 0
Name I2CTO7 I2CTO6 I2CTO5 I2CTO4 I2CTO3 I2CTO2 I2CTO1 I2CTO0
Reset 0 0 0 0 0 0 0 0
Access rw rw rw rw rw rw rw rw
(93 páginas)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentários a estes Manuais