h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 590

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 17 Host Interface [H8S/2138 Group]
17.3
17.3.1
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
0
1
For host read/write timing, see section 25.6.4, Timing of On-Chip Supporting Modules.
17.3.2
Table 17.6 indicates the slave operations carried out in response to host interface signals from the
host processor.
Rev. 4.00 Jun 06, 2006 page 536 of 1004
REJ09B0301-0400
Operation
Host Interface Operation
Control States
CS2E
—
0
1
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