ST10F280_12 datasheet(97/239 Pages) STMICROELECTRONICS

97 / 239 page

ST10F280

Parallel ports

Doc ID 8673 Rev. 3

97/239

Edge characteristic defines the rise/fall time for the respective output, ie. the transition time.

Slow edge reduce the peak currents that are sinked/sourced when changing the voltage

level of an external capacitive load. For a bus interface or pins that are changing at

frequency higher than 1MHz, however, fast edges may still be required.

Driver characteristic defines either the general driving capability of the respective driver, or if

the driver strength is reduced after the target output level has been reached or not.

Reducing the driver strength increases the output’s internal resistance, which attenuates

noise that is imported via the output line. For driving LEDs or power transistors, however, a

stable high output current may still be required.

For each feature, a 2-bit control field (ie. 4 bits) is provided for each group of 4 port pads (ie.

a port nibble), in port output control registers POCONx.

POCONx

Address:

0xF0yyh / zzh for 8-bit Ports ESFR

Reset:

0x--00h

Type:

R/W

POCONx

Address:

0xF0yyh / zzh for 16-bit Ports ESFR

Reset:

0x0000h

Type:

R/W

Note:

In case of reading an 8 bit P0CONX register, high Byte (bit 15..8) is read as 00h.

---

PN1DC

PN1EC

PN0DC

PN0EC

R/W

PN3DC

PN3EC

PN2DC

PN2EC

PN1DC

PN1EC

PN0DC

PN0EC

R/W

PNxEC Port Nibble x Edge Characteristic (rise/fall time)

00: Fast edge mode, rise/fall times depend on the driver’s dimensioning.

01: Slow edge mode, rise/fall times ~60 ns

10: Reserved

11: Reserved

PNxDC Port Nibble x Driver Characteristic (output current)

00: High Current mode: Driver always operates with maximum strength.

01: Dynamic Current mode: Driver strength is reduced after the target level has been

reached.

10: Low Current mode: Driver always operates with reduced strength.

11: Reserved

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