MSC1202Y2RHHT datasheet(51/92 Pages) TI1

51 / 92 page

MSC1200

MSC1201

MSC1202

SBAS317E − APRIL 2004 − REVISED MAY 2006

www.ti.com

Port 1 (P1)

Reset Value

SFR 90h

P1.7

INT5

P1.6

INT4

P1.5

INT3

P1.4

INT2/SS

P1.3

DIN

P1.2

DOUT

P1.1

P1.0

PROG

FFh

P1.7−0

General-Purpose I/O Port 1. This register functions as a general-purpose I/O port. In addition, all the pins have an

bits 7−0

alternative function listed below. Each of the functions is controlled by several other SFRs. The associated Port 1

latch bit must contain a logic ‘1’ before the pin can be used in its alternate function capacity. To use the alternate

function, set the appropriate mode in P1DDRL (SFR AEh), P1DDRH (SFR AFh).

INT5

External Interrupt 5. A falling edge on this pin will cause an external interrupt 5 if enabled.

bit 7

INT4

External Interrupt 4. A rising edge on this pin will cause an external interrupt 4 if enabled.

bit 6

INT3

External Interrupt 3. A falling edge on this pin will cause an external interrupt 3 if enabled.

bit 5

INT2/SS

External Interrupt 2. A rising edge on this pin will cause an external interrupt 2 if enabled. This pin can be used as

bit 4

slave select (SS) in SPI slave mode.

DIN

Serial Data In. This pin receives serial data in SPI and I2C modes (in I2C mode, this pin should be configured as an

bit 3

input) or standard 8051.

DOUT

Serial Data Out. This pin transmits serial data in SPI and I2C modes (in I2C mode, this pin should be configured as

bit 2

an open drain) or standard 8051.

PROG

Program Mode. When this pin is pulled low at power-up, the device enters Serial Programming mode (refer to

bit 0

Figure 2).

External Interrupt Flag (EXIF)

Reset Value

SFR 91h

IE5

IE4

IE3

IE2

08h

IE5

External Interrupt 5 Flag. This bit will be set when a falling edge is detected on INT5. This bit must be cleared

bit 7

manually by software. Setting this bit in software will cause an interrupt if enabled.

IE4

External Interrupt 4 Flag. This bit will be set when a rising edge is detected on INT4. This bit must be cleared

bit 6

manually by software. Setting this bit in software will cause an interrupt if enabled.

IE3

External Interrupt 3 Flag. This bit will be set when a falling edge is detected on INT3. This bit must be cleared

bit 5

manually by software. Setting this bit in software will cause an interrupt if enabled.

IE2

External Interrupt 2 Flag. This bit will be set when a rising edge is detected on INT2. This bit must be cleared

bit 4

manually by software. Setting this bit in software will cause an interrupt if enabled.

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