I
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C Module LH79524/LH79525 User’s Guide
9-10 Version 1.0
9.2.2.5 I
2
C Clock High Time Register (ICHCNT)
The ICHCNT register allows programming the length of the serial clock HIGH time.
9.2.2.6 I
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C Clock Low Time Register (ICLCNT)
The ICLCNT register allows programming the length of the serial clock LOW time.
Table 9-12. ICHCNT Register
BIT 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FIELD ///
RESET 0000000000000000
TYPE RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO
BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FIELD /// HCNT
RESET 0000000000000000
TYPE RO RO RO RO RO RO RO RO RW RW RW RW RW RW RW RW
ADDR 0xFFFC5000 + 0x10
Table 9-13. ICHCNT Fields
BITS NAME DESCRIPTION
31:8 /// Reserved Reading returns 0. Write the reset value.
7:0 HCNT
High Count This field allows programming the SCL HIGH time, in HCLK
periods. The value is a hexadecimal number. The HIGH time is ICHCNT + 3
HCLK periods in 100 kbit/s mode, and ICHCNT + 4 HCLK cycles in 400 kbit/s
mode. The ICHCNT Register must be programmed before any I
2
C bus transac-
tion can take place to insure proper timing.
Table 9-14. ICLCNT Register
BIT 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FIELD ///
RESET 0000000000000000
TYPE RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO
BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FIELD /// LCNT
RESET 0000000000000000
TYPE RO RO RO RO RO RO RO RO RW RW RW RW RW RW RW RW
ADDR 0xFFFC5000 + 0x14
Table 9-15. ICLCNT Fields
BITS NAME DESCRIPTION
31:8 /// Reserved Reading returns 0. Write the reset value.
7:0 LCNT
Low Count This register allows programming the SCL LOW time, in HCLK periods.
The value is a hexadecimal number. The LOW time is ICLCNT + 3 HCLK periods in
100 kbit/s mode, and ICLCNT + 4 HCLK cycles in 400 kbit/s mode. The ICLCNT Reg-
ister must be set before any I
2
C bus transaction takes place to insure proper timing.
Note that the value in this register must be at least 3 for proper I
2
C operation.
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