Datasheet

Section 18 Keyboard Buffer Control Unit (PS2)
Rev. 3.00 Sep. 28, 2009 Page 565 of 910
REJ09B0350-0300
18.3.1 Keyboard Control Register 1 (KBCR1)
KBCR1 controls data transmission and interrupt, selects parity, and detects transmit error.
Bit Bit Name
Initial
Value R/W Description
7 KBTS 0 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
6 PS 0 R/W Transmit Parity Selection
Selects even or odd parity.
0: Selects odd parity
1: Selects even parity
5 KCIE 0 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