h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 587

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

17.1
The H8S/2169 or H8S/2149 has three on-chip keyboard buffer controller channels, designated 0 to
2. The keyboard buffer controller is provided with functions conforming to the PS/2 interface
specifications.
Data transfer using the keyboard buffer controller employs a data line (KD) and a clock line,
providing economical use of connectors, board surface area, etc. Figure 17.1 shows how the
keyboard buffer controller is connected.
17.1.1
Conforms to PS/2 interface specifications
Direct bus drive (via the KCLK and KD pins)
Interrupt sources: on completion of data reception and on detection of clock edge
Error detection: parity error and stop bit monitoring
(H8S/2169 or H8S/2149 chip)
KCLK out
Keyboard buffer controller
Overview
Features
KCLK in
KD out
KD in
System side
Section 17 Keyboard Buffer Controller
Figure 17.1 Keyboard Buffer Controller Connection
Vcc
Vcc
Clock
Data
Rev. 3.00 Jan 18, 2006 page 559 of 1044
Section 17 Keyboard Buffer Controller
Keyboard side
I/F
KCLK in
KCLK out
KD in
KD out
REJ09B0280-0300