ST10F269Z2QX View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST10F269Z2QX

16-BIT MCU WITH MAC UNIT, 256K BYTE FLASH MEMORY AND 12K BYTE RAM

STMicroelectronics 

ST10F269Z2Qx

12.6.1 - Alternate Functions of Port 3

The pins of Port 3 serve for various functions which include external timer control lines, the two serial

interfaces and the control lines BHE/WRH and CLKOUT.

Table 16 : Port 3 Alternative Functions

Port 3 Pin

Alternate Function

P3.0

P3.1

P3.2

P3.3

P3.4

P3.5

P3.6

P3.7

P3.8

P3.9

P3.10

P3.11

P3.12

P3.13

P3.14

P3.15

T0IN

T6OUT

CAPIN

T3OUT

T3EUD

T4IN

T3IN

T2IN

MRST

MTSR

TxD0

RxD0

BHE/WRH

SCLK

---

CLKOUT

CAPCOM1 Timer 0 Count Input

Timer 6 Toggle Output

GPT2 Capture Input

Timer 3 Toggle Output

Timer 3 External Up/Down Input

Timer 4 Count Input

Timer 3 Count Input

Timer 2 Count Input

SSC Master Receive / Slave Transmit

SSC Master Transmit / Slave Receive

ASC0 Transmit Data Output

ASC0 Receive Data Input (Output in synchronous mode)

Byte High Enable / Write High Output

SSC Shift Clock Input/Output

No pin assigned

System Clock Output

Figure 27 : Port 3 I/O and Alternate Functions

Alternate Function

No Pin

Port 3

P3.15

P3.13

P3.12

P3.11

P3.10

P3.9

P3.8

P3.7

P3.6

P3.5

P3.4

P3.3

P3.2

P3.1

P3.0

General Purpose Input/Output

a)

CLKOUT

SCLK

BHE

RxD0

TxD0

MTSR

MRST

T2IN

T3IN

T4IN

T3EUD

T3OUT

CAPIN

T6OUT

T0IN

b)

WRH

The structure of the Port 3 pins depends on their

alternate function (see figures 28 and 29). When

the on-chip peripheral associated with a Port 3 pin

is configured to use the alternate input function, it

reads the input latch, which represents the state

of the pin, via the line labeled “Alternate Data

Input”. Port 3 pins with alternate input functions

are: T0IN, T2IN, T3IN, T4IN, T3EUD and CAPIN.

When the on-chip peripheral associated with a

Port 3 pin is configured to use the alternate output

function, its “Alternate Data Output” line is ANDed

with the port output latch line. When using these

alternate functions, the user must set the direction

of the port line to output (DP3.y=1) and must set

the port output latch (P3.y=1). Otherwise the pin is

in its high-impedance state (when configured as

input) or the pin is stuck at '0' (when the port

output latch is cleared). When the alternate output

functions are not used, the “Alternate Data

Output” line is in its inactive state, which is a high

level ('1').

70/161

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