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CHAPTER 6 PIN FUNCTIONS
128
6.1.7 Debug Serial Interface Signals
The debug serial interface signals control data transfer between the V
R
4101 and debug serial controller.
Table 6-7 lists the functions of these signals.
Table 6-7. Debug Serial Interface Signals
Signal name
I/O
Definition
Function
DDIN
I
Debug Serial Data In
Debug serial data input signal. This signal is used to transfer data
from the V
R
4101 to the external debug serial controller.
DDOUT
O
Debug Serial Data
Out
Debug serial data output signal. This signal is used to transfer data
from the external debug serial controller to the V
R
4101.
6.1.8 Keyboard Interface Signals
The keyboard interface signals control the keyboard circuit connected to the V
R
4101. Table 6-8 lists the
functions of these signals.
Table 6-8. Keyboard Interface Signals
Signal name
I/O
Definition
Function
KPORT[7..0]
I
Key Scan Data In
Keyboard scan data input signal. This signal is used to scan the
pressed/released states of the keyboard.
KSCAN[7..2]
O
Key Scan Data Out
Keyboard scan data output signal. This signal is used to activate the
scan lines when the keyboard pressed/released states are being
scanned.
KSCAN[1]/
EVINC
O
Key Scan Data Out/
Electric Volume
Input Clock
Signal generated by multiplexing the keyboard scan data output signal
and electronic volume control clock signal. When EVINC is enabled
by the EVINCEN bit in the EVVOLREG, this signal functions as the
clock output pin for the electronic volume controller.
KSCAN[0]/
EVUD
O
Key Scan Data Out/
Electric Volume
Up/Down
Signal generated by multiplexing the keyboard scan data output signal
and electronic volume up/down signal. When EVUD is enabled by the
EVUDEN bit in the EVVOLREG, this signal functions as the volume
up/down pin for the electronic volume controller.