Datasheet

Section 18 Keyboard Buffer Control Unit (PS2)
Rev. 3.00 Sep. 28, 2009 Page 569 of 910
REJ09B0350-0300
Bit Bit Name
Initial
Value R/W Description
3 KBIE 0 R/W Keyboard Interrupt Enable
Enables or disables interrupts from the keyboard
buffer control unit to the CPU.
0: Interrupt requests are disabled
1: Interrupt requests are enabled
2 KBF 0 R/(W)* Keyboard Buffer Register Full
Indicates that data reception has been completed and
the received data is in KBBR. When both KBIE and
KBF are set to1, an interrupt request is sent to the
CPU.
0: [Clearing condition]
Read KBF when KBF =1, then write 0 in KBF
1: [Setting conditions]
• When data has been received normally and has
been transferred to KBBR while KBFSEL = 1
(keyboard buffer register full flag)
• When a KCLK falling edge is detected while
KBFSEL = 0 (KCLK interrupt flag)
1 PER 0 R/(W)* Parity Error
Indicates that an odd parity error has occurred.
0: [Clearing condition]
Read PER when PER =1, then write 0 in PER
1: [Setting condition]
When an odd parity error occurs
0 KBS 0 R Keyboard Stop
Indicates the receive data stop bit. Valid only when
KBF = 1.
0: 0 stop bit received
1: 1 stop bit received
Note: * Only 0 can be written for clearing the flag.