Microcontrollers User manual

UM10237_2 © NXP B.V. 2008. All rights reserved.
User manual Rev. 02 — 19 December 2008 172 of 792
NXP Semiconductors
UM10237
Chapter 8: LPC24XX Pin configuration
P4[21]/A21/
SCL2/SSEL1
115
[1]
M15
[1]
I/O P4[21] — General purpose digital input/output pin.
I/O A21 — External memory address line 21.
I/O SCL2 — I
2
C2 clock input/output (this is not an open-drain pin).
I/O SSEL1 — Slave Select for SSP1.
P4[22]/A22/
TXD2/MISO1
123
[1]
K14
[1]
I/O P4[22] — General purpose digital input/output pin.
I/O A22 — External memory address line 22.
O TXD2 — Transmitter output for UART2.
I/O MISO1 — Master In Slave Out for SSP1.
P4[23]/A23/
RXD2/MOSI1
129
[1]
J15
[1]
I/O P4[23] — General purpose digital input/output pin.
I/O A23 — External memory address line 23.
I RXD2 — Receiver input for UART2.
I/O MOSI1 — Master Out Slave In for SSP1.
P4[24]/OE
183
[1]
B8
[1]
I/O P4[24] — General purpose digital input/output pin.
O OE
— LOW active Output Enable signal.
P4[25]/WE
179
[1]
B9
[1]
I/O P4[25] — General purpose digital input/output pin.
O WE
— LOW active Write Enable signal.
P4[26]/BLS0
119
[1]
L15
[1]
I/O P4[26] — General purpose digital input/output pin.
O BLS0
— LOW active Byte Lane select signal 0.
P4[27]/BLS1
139
[1]
G15
[1]
I/O P4[27] — General purpose digital input/output pin.
O BLS1
— LOW active Byte Lane select signal 1.
P4[28]/BLS2
/
MAT2[0]/LCDVD[6]/
LCDVD[10]/
LCDVD[2]/
TXD3
170
[1]
C11
[1]
I/O P4 [28] — General purpose digital input/output pin.
O BLS2
— LOW active Byte Lane select signal 2.
O MAT2[0] — Match output for Timer 2, channel 0.
[19]
O LCDVD[6]/LCDVD[10]/LCDVD[2] — LCD data.
[19]
O TXD3 — Transmitter output for UART3.
P4[29]/BLS3
/
MAT2[1]
LCDVD[7]/
LCDVD[11]/
LCDVD[3]/RXD3
176
[1]
B10
[1]
I/O P4[29] — General purpose digital input/output pin.
O BLS3
— LOW active Byte Lane select signal 3.
O MAT2[1] — Match output for Timer 2, channel 1.
[19]
O LCDVD[7]/LCDVD[11]/LCDVD[3] — LCD data.
[19]
I RXD3 — Receiver input for UART3.
P4[30]/CS0
187
[1]
B7
[1]
I/O P4[30] — General purpose digital input/output pin.
O CS0
— LOW active Chip Select 0 signal.
P4[31]/CS1
193
[1]
A4
[1]
I/O P4[31] — General purpose digital input/output pin.
O CS1
— LOW active Chip Select 1 signal.
ALARM 37
[8]
N1
[8]
O ALARM — RTC controlled output. This is a 1.8 V pin. It goes HIGH when
a RTC alarm is generated.
USB_D−2 52 U1 I/O USB_D−2 — USB port 2 bidirectional D− line.
DBGEN 9
[1]
F4
[1]
I DBGEN — JTAG interface control signal. Also used for boundary
scanning.
TDO 2
[1]
D3
[1]
O TDO — Test Data Out for JTAG interface.
TDI 4
[1]
C2
[1]
I TDI — Test Data In for JTAG interface.
Table 124. LPC2470/78 pin description
…continued
Symbol Pin Ball Type Description