HD6432138SW datasheet(590/1061 Pages) RENESAS

Part #	HD6432138SW

Description	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 17 Host Interface [H8S/2138 Group]

Rev. 4.00 Jun 06, 2006 page 536 of 1004

REJ09B0301-0400

17.3

Operation

17.3.1

Host Interface Operation

The host interface is activated by setting the HI12E bit (bit 0) to 1 in SYSCR2 in single-chip

mode, establishing slave mode. Activation of the host interface (entry to slave mode) appropriates

the related I/O lines in port 3 (data), port 8 or 9 (control), and port 4 (host interrupt requests) for

interface use.

Table 17.5 shows HIF host interface channel selection and pin operation.

Table 17.5

Host Interface Channel Selection and Pin Operation

HI12E

CS2E

Operation

—

Host interface functions halted

Host interface channel 1 only operating

Operation of channel 2 halted

(No operation as

CS2 or ECS2 input. Pins P43, P81, and P90 operate as

I/O ports.)

Host interface channel 1 and 2 functions operating

For host read/write timing, see section 25.6.4, Timing of On-Chip Supporting Modules.

17.3.2

Control States

Table 17.6 indicates the slave operations carried out in response to host interface signals from the

host processor.

HD6432138SW Datasheet(PDF) 590 Page - Renesas Technology Corp