ST10F269-Q3 datasheet(72/160 Pages) STMICROELECTRONICS

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ST10F269

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Pin P3.12 (BHE/WRH) is another pin with an

alternate output function, however, its structure is

slightly different.

After reset the BHE or WRH function must be

used

depending

the

system

start-up

configuration. In either of these cases, there is no

possibility to program any port latches before.

Thus,

the

appropriate

alternate

function

selected automatically. If BHE/WRH is not used in

the system, this pin can be used for general

purpose I/O by disabling the alternate function

(BYTDIS = ‘1’ / WRCFG=’0’).

Note: Enabling the BHE or WRH function automatically enables the P3.12 output driver. Setting bit

DP3.12=’1’ is not required.

During bus hold pin P3.12 is switched back to its standard function and is then controlled by

DP3.12 and P3.12. Keep DP3.12 = ’0’ in this case to ensure floating in hold mode.

Figure 29 : Block Diagram of Pins P3.15 (CLKOUT) and P3.12 (BHE/WRH)

Direction

Latch

Write DP3.x

Read DP3.x

Port Output

Latch

Write P3.x

Read P3.x

MUX

Alternate

Data

Output

MUX

“1”

Input

Latch

Clock

P3.12/BHE

P3.15/CLKOUT

Output

Buffer

x = 15, 12

Alternate

Function

Enable

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