Freescale Semiconductor M9328MX21ADSE User Manual

Freescale Semiconductor

3-25

Connector P5 is the ADS External Keypad connector. Figure 3-13 shows pin assignments and Table 3-13 
provides signal descriptions for the connector.

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

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.