ST10F296 datasheet(169/346 Pages) STMICROELECTRONICS

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13.11

XPort 9

XPort 9 is enabled by setting the XPEN and XPORTEN bits of the SYSCON and XPERCON

registers respectively. On the XBus interface, the registers are not bit-addressable.

This 16-bit port is used for general purpose I/O. The direction of each line can be configured

via the corresponding direction register XDP9. Each port line can be switched into push-pull

or open-drain output mode via the open-drain control register XODP9. The port lines can

also be switeched into TTL/CMOS input through the input threshold control register

XPICON9 (Section 13.1.2: Input threshold control on page 121).

All port lines can be individually (bit-wise) programmed. The ‘bit-addressable’ feature is

available via specific ‘set’ and ‘clear’ registers: XP9SET, XP9CLR, XDP9SET, XDP9CLR,

XODP9SET, XODP9CLR, XPICON9SET, and XPICON9CLR.

13.11.1

XPort 9 registers

XP9 register

XP9SET register

XP9 (EB80h)

XBus

Reset value: 0000h

987

65432

XP9

.15

XP9

.14

XP9

.13

XP9

.12

XP9

.11

XP9

.10

XP9

Table 102.

XP9 register description

Bit

Bit name

Function

15-0

XP9.y

Port data register XP9 bit y

XP9SET (EB82h)

XBus

Reset value: 0000h

987

65432

XP9

SET

.15

XP9

SET

.14

XP9

SET

.13

XP9

SET

.12

XP9

SET

.11

XP9

SET

.10

XP9

SET

XP9

SET

XP9

SET

XP9

SET

XP9

SET

XP9

SET

XP9

SET

XP9

SET

XP9

SET

XP9

SET

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Table 103.

XP9SET register description

Bit

Bit name

Function

15-0

XP9SET.y

Writing a 1 sets the corresponding bit of the XP9.y register. Writing a 0

has no effect.

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