Register Descriptions; Keyboard Control Register 1 (Kbcr1) - Renesas H8S Series Hardware Manual

17.3

Register Descriptions

The KBU has the following registers for each channel.

• Keyboard control register 1 (KBCR1)

• Keyboard control register 2 (KBCR2)
• Keyboard control register H (KBCRH)
• Keyboard control register L (KBCRL)
• Keyboard data buffer register (KBBR)
• Keyboard buffer transmit data register (KBTR)
17.3.1 Keyboard Control Register 1 (KBCR1)
KBCR1 controls data transmission and interrupt, selects parity, and detects transmit error.
Bit Bit Name Initial Value
7 KBTS 0
6 PS 0
5 KCIE 0
R/W Description
R/W Transmit Start
Selects start of data transmission or disables transmission.
0: Data transmission is disabled
[Clearing conditions]
•
When 0 is written
•
When the KBTE is set to 1
•
When the KBIOE is cleared to 0
1: Starts data transmission
[Setting condition]
•
When 1 is written after reading the KBTS = 0
R/W Transmit Parity Selection
Selects even or odd parity.
0: Selects odd parity
1: Selects even parity
R/W First KCLK Falling Interrupt Enable
Selects whether an interrupt at the first falling edge of
KCLK is enabled or disabled.
0: Disables first KCLK falling interrupt
1: Enables first KCLK falling interrupt
Section 17 Keyboard Buffer Control Unit (KBU)
Rev. 3.00 Jul. 14, 2005 Page 585 of 986
REJ09B0098-0300