P90CE201 datasheet(6/77 Pages) PHILIPS

6 / 77 page

August 1993

Philips Semiconductors

Product speciﬁcation

16-bit microcontroller

P90CE201

4.2

Pin description

Table 1

QFP64 package.

MNEMONIC

TYPE

PIN NO.

FUNCTION

RXD

I/O

Receive Data. RXD is the data input for the UART interface.

SDA2

I/O

Serial Data 2 (open drain). SDA2 is the data signal for the second

I2C-bus serial interface.

SCL2

I/O

Serial Clock 2 (open drain). SCL2 is the clock signal for the second

I2C-bus serial interface.

GP7/SDA1

GP6/SCL1

GP0

GP1

GP2

GP3

GP4

GP5/T1

I/O

General Purpose Port (active HIGH, 3-state). The alternative functions

are as follows. SCL1 is the clock signal for the ﬁrst I2C-bus serial

interface. SDA1 is the data signal for the ﬁrst I2C-bus serial interface.

T1 is the input pin for Timer 1.

A23/AP7

A16/AP0

I/O

12 to 15, 21,

22, 24, 23

Address Bus. Upper 8-bits of the address bus (A23 to A16). The unused

address bits can be selected as a quasi-bidirectional port (AP).

A15 to A0

25, 26, 28, 27,

34, 38, 32, 30,

29, 31, 33, 35,

37, 39, 40, 42

Address Bus. Lower 16-bits of the address bus.

XTAL2

Oscillator output. Not connected if an external clock generator is used.

XTAL1

Oscillator input. XTAL1 can also be used as an external clock input if

an external clock generator is used.

VDD1

−

Supply voltage. For internal logic, address bus, data bus, RWN,

CSRAMN, CSROMN, XTAL1 and XTAL2.

VSS1

−

Ground. For internal logic, address bus, data bus, RWN, CSRAMN,

CSROMN, XTAL1 and XTAL2.

R/WN

Read (active HIGH)/Write (active LOW). This controls the direction of

data ﬂow.

CSROMN

Chip Select ROM (active LOW). This signal selects external ROM.

D0 to D7

44, 46, 48, 49,

47, 45, 43, 41

Data Bus. 8-bit data bus.

CSRAMN

Chip Select RAM (active LOW). This signal enables external RAM.

VSS2

−

Ground. For all other periphery pins (quiet port).

VDD2

−

Supply voltage. For all other periphery pins (quiet port).

RESET

Reset (active HIGH). Input pin for an external reset.

Timer 0. Input pin for cycle and event counting using Timer 0.

Timer 2. Input pin for cycle and event counting using Timer 2.

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