IFKEY10A_000020020700
Rev. 1.00, 05/04, page 349 of 544
Section 14 Keyboard Buffer Controller
This LSI has three on-chip keyboard buffer controller channels. 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
(KCLK), providing economical use of connectors, board surface area, etc. Figure 14.1 shows a
block diagram of the keyboard buffer controller.
14.1 Features
•
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
KD
(PS2AD,
PS2BD,
PS2CD)
KDI
KCLKI
KDO
KCLKO
Parity
Register counter value
KBI interrupt
KCLK
(PS2AC,
PS2BC,
PS2CC)
[Legend]
KD:
KBC data I/O pin
KCLK:
KBC clock I/O pin
KBBR:
Keyboard data buffer register
KBCRH:
Keyboard control register H
KBCRL:
Keyboard control register L
Control
logic
KBBR
KBCRH
KBCRL
Bus interface
Internal
data bus
Module data bus
Figure 14.1 Block Diagram of Keyboard Buffer Controller
Содержание H8S/2111B
Страница 2: ...Rev 1 00 05 04 page ii of xxxiv...
Страница 8: ...Rev 1 00 05 04 page viii of xxxiv...
Страница 22: ...Rev 1 00 05 04 page xxii of xxxiv...
Страница 30: ...Rev 1 00 05 04 page xxx of xxxiv...
Страница 84: ...Rev 1 00 05 04 page 50 of 544...
Страница 100: ...Rev 1 00 05 04 page 66 of 544...
Страница 126: ...Rev 1 00 05 04 page 92 of 544...
Страница 180: ...Rev 1 00 05 04 page 146 of 544...
Страница 216: ...Rev 1 00 05 04 page 182 of 544...
Страница 254: ...Rev 1 00 05 04 page 220 of 544...
Страница 268: ...Rev 1 00 05 04 page 234 of 544...
Страница 382: ...Rev 1 00 05 04 page 348 of 544...
Страница 462: ...Rev 1 00 05 04 page 428 of 544...
Страница 464: ...Rev 1 00 05 04 page 430 of 544...
Страница 488: ...Rev 1 00 05 04 page 454 of 544...
Страница 496: ...Rev 1 00 05 04 page 462 of 544...
Страница 574: ...Rev 1 00 05 04 page 540 of 544...
Страница 581: ......
Страница 582: ...H8S 2111B Hardware Manual...