Datasheet

ST10F269 12 - PARALLEL PORTS
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The table lists the defined POCON registers and the allocation of control bit-fields and port pins.
Dedicated Pins Output Control
Programmable pad drivers also are supported for the dedicated pins ALE, RD
and WR. For these pads, a
special POCON20 register is provided.
POCON20 (F0AAh / 55h) ESFR Reset Value: --00h
Table 18 : Port Control Register Allocation
Control
Register
Physical
Address
8-bit
Address
Controlled Port Nibble
3
210
POCON0L F080h 40h P0L.7...4 P0L.3...0
POCON0H F082h 41h P0H.7...4 P0H.3...0
POCON1L F084h 42h P1L.7...4 P1L.3...0
POCON1H F086h 43h P1H.7...4 P1H.3...0
POCON2 F088h 44h P2.15...12 P2.11...8 P2.7...4 P2.3...0
POCON3 F08Ah 45h P3.15, 3.13, 3.12 P3.11...8 P3.7...4 P3.3...0
POCON4 F08Ch 46h P4.7...4 P4.3...0
POCON6 F08Eh 47h P6.7...4 P6.3...0
POCON7 F090h 48h P7.7...4 P7.3...0
POCON8 F092h 49h P8.7...4 P8.3...0
1514131211109876543210
--------PN1DC PN1EC PN0DC PN0EC
RW RW RW RW
PN0EC RD, WR Edge Characteristic (rise/fall time)
00: Fast edge mode, rise/fall times depend on the size of the driver.
01: Slow edge mode, rise/fall times ~60 ns
10: Reserved
11: Reserved
PN0DC RD
, WR 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
PN1EC ALE Edge Characteristic (rise/fall time)
00: Fast edge mode, rise/fall times depend on the size of the driver.
01: Slow edge mode, rise/fall times ~60 ns
10: Reserved
11: Reserved
PN1DC ALE 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