HD6432138SW datasheet(562/1061 Pages) RENESAS

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Section 16 I

2C Bus Interface [H8S/2138 Group Option]

Rev. 4.00 Jun 06, 2006 page 508 of 1004

REJ09B0301-0400

Table 16.7

Permissible SCL Rise Time (t

Sr) Values

Time Indication

IICX

cyc

Indication

2C Bus

Specification

(Max.)

φφφφ =

5 MHz

φφφφ =

8 MHz

φφφφ =

10 MHz

φφφφ =

16 MHz

φφφφ =

20 MHz

07.5t

cyc

Normal mode

1000 ns

1000 ns 937 ns

750 ns

468 ns

375 ns

High-speed

mode

300 ns

17.5t

cyc

Normal mode

1000 ns

1000 ns 1000 ns

1000 ns 1000 ns 875 ns

High-speed

mode

300 ns

• The I2C bus interface specifications for the SCL and SDA rise and fall times are under 1000 ns

and 300 ns. The I

2C bus interface SCL and SDA output timing is prescribed by t

cyc, as shown in

table 16.6. However, because of the rise and fall times, the I

2C bus interface specifications may

not be satisfied at the maximum transfer rate. Table 16.8 shows output timing calculations for

different operating frequencies, including the worst-case influence of rise and fall times.

BUFO fails to meet the I

2C bus interface specifications at any frequency. The solution is either (a)

to provide coding to secure the necessary interval (approximately 1 µs) between issuance of a

stop condition and issuance of a start condition, or (b) to select devices whose input timing

permits this output timing for use as slave devices connected to the I

2C bus.

SCLLO in high-speed mode and tSTASO in standard mode fail to satisfy the I

2C bus interface

specifications for worst-case calculations of t

Sr/tSf. Possible solutions that should be investigated

include (a) adjusting the rise and fall times by means of a pull-up resistor and capacitive load,

(b) reducing the transfer rate to meet the specifications, or (c) selecting devices whose input

timing permits this output timing for use as slave devices connected to the I

2C bus.

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