ST2202 datasheet(15/65 Pages) ETC

15 / 65 page

Sitronix

ST2202

Ver 2.0a

15/65

2003-May-05

Port-A is designed for keyboard scan with de-bounce and

transition triggered interrupt, while Port-C/D/E are multiplexed

with other system functions, and are controlled by PFC, PFD,

and PMCR[2:0]. Port-L is shared with LCD specific signals of

LCDC. Turning off LCDC by setting LPWR (LCTR[7]) reserves

Port-L for GPIO.

Selecting respective pins to be GPIO or signals of system

function will not affect original settings of I/O directions and

types. This extends the flexibility of the usage of function

signals.

Note: All the properties of pins are still programmable

and must be ascertained before they are

assigned to system functions, especially the

direction of pins.

TABLE 9-3 Port Control Registers

Address

Name

R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

$008~$00C / $07E PCA~PCE, PCL R/W PCx[7] PCx[6] PCx[5] PCx[4] PCx[3] PCx[2] PCx[1] PCx[0] 0000 0000

Bit 7~0: PCx[7:0] : Port-x direction control bits

0 = Input mode

1 = Output mode

TABLE 9-4 Port Data Registers

Address

Name

R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

$000~$004 / $07C PA~PE, PL R/W

Px[7]

Px[6]

Px[5]

Px[4]

Px[3]

Px[2]

Px[1]

Px[0]

1111 1111

Bit 7~0: Px[7:0] : Port data / pull-resistor control bits

I/O Modes

R/W

Input Mode

Output Mode

Read

Input data

Write

0 = Disable pull-up resistor

Select pull-down resistor (Port-C only)

1 = Select pull-up resistor

Output data

TABLE 9-5 Port I/O Type Select Registers

Address

Name

R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

$005

PSC

R/W PSC[7] PSC[6] PSC[5] PSC[4] PSC[3] PSC[2] PSC[1] PSC[0] 1111 1111

Bit 7~0: PSC[7:0] : Port I/O types selection bits

Input Mode

Output Mode

0 = Disable pull-up/down resisters

1 = Enable pull-up/down resisters

0 = Open-drain

1 = CMOS

TABLE 9-6 Port Function Select Registers

Address

Name

R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

$00D

PFC

R/W RXD0

TXD0 SRDY

MOSI

MISO

SCK

INTX 0000 0000

$00E

PFD

R/W RXD1

TXD1

CS6

CS5

CS4

CS3

CS2

CS1

0000 0000

Bit 7~0: PFC/D[7:0] : Port function select bits

0 = GPIO

1 = Indicated function signal is connected

TABLE 9-7 Port Miscellaneous Control Register (PMCR)

Address Name

R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

$00F

PMCR

R/W

PULL

PDBN

INTEG

CSM1

CSM0

BCO

TCO1

TCO0

1000 0000

Bit 7: PULL : Enable/disable all pull-up resisters of Port-A/B/D/E/L

1 = Enable pull-up resisters

0 = Disable pull-up resisters

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