XA-G37 Datasheet, PDF(7/37 Page) NXP Semiconductors – XA 16-bit microcontroller family 32K OTP, 512 B RAM, watchdog, 2 UARTs

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XA-G37 Datasheet, PDF (7/37 Pages) NXP Semiconductors – XA 16-bit microcontroller family 32K OTP, 512 B RAM, watchdog, 2 UARTs

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Philips Semiconductors

XA 16-bit microcontroller family

32K OTP, 512 B RAM, watchdog, 2 UARTs

Product data

XA-G37

PIN. NO.

MNEMONIC

PLCC LQFP

PSEN

EA/WAIT/ 35

VPP

XTAL1

XTAL2

TYPE

NAME AND FUNCTION

O Program Store Enable: The read strobe for external program memory. When the microcontroller

accesses external program memory, PSEN is driven low in order to enable memory devices. PSEN

is only active when external code accesses are performed.

I External Access/Wait: The EA input determines whether the internal program memory of the

microcontroller is used for code execution. The value on the EA pin is latched as the external reset

input is released and applies during later execution. When latched as a 0, external program

memory is used exclusively, when latched as a 1, internal program memory will be used up to its

limit, and external program memory used above that point. After reset is released, this pin takes on

the function of bus Wait input. If Wait is asserted high during any external bus access, that cycle

will be extended until Wait is released. During EPROM programming, this pin is also the

programming supply voltage input.

I Crystal 1: Input to the inverting amplifier used in the oscillator circuit and input to the internal clock

generator circuits.

O Crystal 2: Output from the oscillator amplifier.

SPECIAL FUNCTION REGISTERS

NAME

DESCRIPTION

SFR

ADDRESS MSB

BIT FUNCTIONS AND ADDRESSES

RESET

LSB VALUE

BCR

BTRH

BTRL

Bus configuration register

Bus timing register high byte

Bus timing register low byte

Code segment

Data segment

Extra segment

IEH*

Interrupt enable high byte

IEL*

Interrupt enable low byte

46A

â WAITD BUSD BC2 BC1 BC0 Note 1

469

DW1 DW0 DWA1 DWA0 DR1 DR0 DRA1 DRA0 FF

468

WM1 WM0 ALEW â

CR1 CR0 CRA1 CRA0 EF

443

441

442

33F 33E 33D 33C 33B 33A 339 338

427

ETI1 ERI1 ETI0 ERI0

337 336 335 334 333 332 331 330

426

ET2 ET1 EX1 ET0 EX0

IPA0

IPA1

IPA2

IPA4

IPA5

Interrupt priority 0

Interrupt priority 1

Interrupt priority 2

Interrupt priority 4

Interrupt priority 5

P0*

Port 0

P1*

Port 1

P2*

Port 2

4A0

PT0

PX0

4A1

PT1

PX1

4A2

PT2

4A4

PTI0

PRI0

4A5

PTI1

PRI1

387 386 385 384 383 382 381 380

430

AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0

38F 38E 38D 38C 38B 38A 389 388

431 T2EX T2 TxD1 RxD1 A3

A1 WRH FF

397 396 395 394 393 392 391 390

432

P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0

2002 Mar 25

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