pc87591l-n05 National Semiconductor Corporation, pc87591l-n05 Datasheet - Page 49

• Manufacturer Part Number: pc87591l-n05
• Description: Lpc Mobile Embedded Controller
• Manufacturer: National Semiconductor Corporation

Revision 1.2
2.0 Signal/Pin Description and Configuration
2.4
2.4.1
The PC87591L-N05 uses the GPIO port pins to multiplex functions, thereby maximizing the device’s flexibility. Table 6 lists
all the pins with such alternate functions and summarizes their selection criteria. To select alternate pin functions, strap in-
puts and configuration registers are used as follows:
When a pin is used as GPIO and not as its alternate function, disable the alternate function in the relevant module’s register.
Pin/Ball
• The ports’ Alternate Function Control register controls the IOPA, IOPB, IOPC, IOPD, IOPE, IOPF and IOPQ pins.
• The environment setting and MCFG bits control port IOPJ, IOPL and IOPM pins. In IRE and OBD environments,
• Interrupts may be enabled together with the use of the pin as input or with its alternate function when the alternate
• Strap inputs and their associated internal pull-down resistor function during V
• The Protection Word registers configure the use of RESET2 input.
• The Pin Multiplexing register (PNMR) configures the use of USART2, A19 and A20 signals.
154/C8 IOPB1
162/C5 IOPB2
165/D5 IOPB7
169/D4 IOPC1
170/C3 IOPC2
153/B9 IOPB0
163/A7 IOPB3
164/B6 IOPB4
LQFP/
FBGA
37/M4
38/N3
40/M2
43/N2
32/K2
36/K1
33/L4
39/L1
5/C2
6/D1
Each of the ports’ pins may be used as a GPIO port or its alternate function, based on the setting of the correspond-
ing bit in PxALT register.
these pins may function either as GPIO or their alternate function (as indicated in the table). In DEV environment,
they all function as their alternate functions.
function is an input. Enabling the interrupt input is done via the port’s alternate function or the respective bit in EICFG
register.
ALTERNATE FUNCTIONS
GPIO with Alternate Functions
IOPB5
IOPB6
IOPA0
IOPA1
IOPA2
IOPA3
IOPA4
IOPA5
IOPA6
IOPA7
Name
GPIO
Type
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
ACCESS.bus
ACCESS.bus
GA20 and
USART1
Module
KBRST
MSWC
PWM
Alternate Function 1
Table 6. Alternate Function Selection
Signal Name
USCLK1
URXD1
UTXD1
KBRST
(GA20)
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
PWM7
SDA1
SDA2
SCL1
RING
SCL2
49
PBALT.5=0
PCALT.1
PCALT.2
PBALT.0
PBALT.1
PBALT.2
PBALT.3
PBALT.4
PBALT.6
PBALT.7
PAALT.0
PAALT.1
PAALT.2
PAALT.3
PAALT.4
PAALT.5
PAALT.6
PAALT.7
Select
(Continued)
1
Module
ICU
CC
Power-Up reset.
Alternate Function 2
Signal Name
RESET2
PFAIL/
2
RST2EN=01
PBALT.7/
PTWRH.
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