Connectors And User Components; Keypad - Motorola MPC564EVB User Manual

Connectors and User Components

Table 1-7. MPC56x Signal Sharing (Continued)
1
Pin MPWM[18]/MDO[6] (H24) could also be used, but is not
enabled at reset and must be enabled via software. This is not
recommended.
2
This signal is needed only if control of EPEE or B0EPEE is
required by the Nexus tool.
3
This should be a 2.6-volt supply and not the ISRAMSTBY current
source.
1.5 Connectors and User Components

1.5.1 Keypad

The Keypad port provides MPC564 I/O connections for a passive 16 key 4x4 matrix keypad
(Axiom HC-KP). The port is applied as 4 column drivers and 4 row inputs. The MPC564
QADC_B Ports PQA[4:7] are column outputs and PQB[4:7] are row inputs. The row inputs have
10K ohm pull-down resistance applied to idle the row inputs low. A simple keypad scan will
enable each column output high one at a time and test the input rows for a high input. Column and
row position can then determine the value of the key pressed. Sample software for driving the
Keypad Port is provided on the MPC5xx support CD.
1-18
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Nexus Signal
Signal
VENDOR_IO0 SGPIOC[7]/IRQOUT/
LWP[0]
VENDOR_IO1 EPEE & B0EPEE
TOOL_IO0
TOOL_IO1
TOOL_IO2
VREF VDD2.6
VALTREF VSTBY
Table 1-8. Keypad
PIN MPC564 I/O SIGNAL
1 QADC_B PQA4 out
2 QADC_B PQA5 out
3 QADC_B PQA6 out
4 QADC_B PQA7 out
MPC564EVB User's Manual
MPC561/MPC563
Ball
R1
2
T23 & T24
— —
— —
— —
VDD
VSTBY2.6
3