ST10F296 datasheet(141/346 Pages) STMICROELECTRONICS

141 / 346 page

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ST10F296E

Parallel ports

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Figure 39.

Block diagram of a Port 3 pin

Pin P3.12 (BHE/WRH) is another pin with an alternate output function. However, its

structure is slightly different to the Port 3 pin (see Figure 40). After reset, the BHE or WRH

function must be used. In either case, port latches cannot be programmed before. Thus, the

appropriate alternate function is 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. In this case, keep DP3.12 = 0 to

ensure floating in hold mode.

Open-drain

latch

Write ODP3.y

Read ODP3.y

Direction

latch

Write DP3.y

Read DP3.y

MUX

Alternate data input

Input

latch

Clock

P3.y

Output

buffer

y = 13, 11 to 0

Port output

latch

Read P3.y

Write P3.y

Alternate

data input

Port data

output

Obsolete

Product(s)

- Obsolete

Product(s)

ST10F296 数据表(PDF) 141 Page - STMicroelectronics

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