9 external keypad connector, External keypad connector -25 – Freescale Semiconductor M9328MX21ADSE User Manual
Page 53
Support Information
M9328MX21ADSE User’s Manual, Rev. A
Freescale Semiconductor
3-25
3.9
External Keypad Connector
Connector P5 is the ADS External Keypad connector. Figure 3-13 shows pin assignments and Table 3-13
provides signal descriptions for the connector.
Figure 3-13. External Keypad Connector P5 Pin Assignments
P5
VCC
1
• •
2
NC
UART2_RXD
3
• •
4
UART2_RTS
UART2_TXD
5
• •
6
UART2_CTS
KP_COL5
7
• •
8
KP_ROW5
KP_COL4
9
• •
10
KP_ROW4
KP_COL3
11
• •
12
KP_ROW3
KP_COL2
13
• •
14
KP_ROW2
KP_COL1
15
• •
16
KP_ROW1
KP_COL0
17
• •
18
KP_ROW0
NC
19
• •
20
GND
Table 3-13. External Keypad Connector P5 Signal Descriptions
Pin(s)
Signal
Description
1
VCC
+3 volt power
2, 19
NC
NO CONNECTION
3
UART2_RXD KEY_COL7 KEYPAD COLUMN 7 — Bidirectional signal used to scan a keypad
4
UART2_RTS KEY_ROW6 KEYPAD ROW 6 — Bidirectional signal used to scan a keypad
5
UART2_TXD KEY_COL6 KEYPAD COLUMN 6 — Bidirectional signal used to scan a keypad
6
UART2_CTS KEY_ROW7 KEYPAD ROW 7 — Bidirectional signal used to scan a keypad
7
KP_COL5
KEYPAD COLUMN 5 — Bidirectional signal used to scan a keypad
8
KP_ROW5
KEYPAD ROW 5 — Bidirectional signal used to scan a keypad
9
KP_COL4
KEYPAD COLUMN 4 — Bidirectional signal used to scan a keypad
10
KP_ROW4
KEYPAD ROW 4 — Bidirectional signal used to scan a keypad
11
KP_COL3
KEYPAD COLUMN 3 — Bidirectional signal used to scan a keypad
12
KP_ROW3
KEYPAD ROW 3 — Bidirectional signal used to scan a keypad
13
KP_COL2
KEYPAD COLUMN 2 — Bidirectional signal used to scan a keypad
14
KP_ROW2
KEYPAD ROW 2 — Bidirectional signal used to scan a keypad
15
KP_COL1
KEYPAD COLUMN 1 — Bidirectional signal used to scan a keypad
16
KP_ROW1
KEYPAD ROW 1 — Bidirectional signal used to scan a keypad
17
KP_COL0
KEYPAD COLUMN 0 — Bidirectional signal used to scan a keypad
18
KP_ROW0
KEYPAD ROW 0 — Bidirectional signal used to scan a keypad
20
GND
GROUND
* The signal name in italics is the function intended for operation with this connector. It is multiplexed in
the i.MX21 processor with the listed signal.