h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 597

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h8s-2169

Manufacturer Part Number
h8s-2169
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
17.3.2
In a transmit operation, KCLK (clock) is an output on the keyboard side, and KD (data) is an
output on the chip (system) side. KD outputs a start bit, 8 data bits (LSB-first), an odd parity bit,
and a stop bit, in that order. The KD value is valid when KCLK is high. A sample transmit
processing flowchart is shown in figure 17.5, and the transmit timing in figure 17.6.
KCLK
(pin state)
KD
(pin state)
KCLK
(input)
KCLK
(output)
KB7 to KB0
PER
KBS
KBF
Transmit Operation
[1] [2] [3]
Previous data
Start
bit
1
0
2
KB0
Figure 17.4 Receive Timing
1
3
KB1
7
9
Parity bit
Rev. 3.00 Jan 18, 2006 page 569 of 1044
10
Section 17 Keyboard Buffer Controller
Receive data
Stop bit
[4] [5]
11
Automatic I/O inhibit
Receive processing/
error handling
REJ09B0280-0300
Flag cleared
[6]

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