SPMC802B datasheet(8/27 Pages) ETC

8 / 27 page

SPMC802B

In SPMC802B, the output mode on PB2 and PB1 can be an

open-drain pin with slow transition by program. To achieve the

slow transition function, programming the bit slowe in RPA to '1'

will enforce the output high to low transition time to 250ns

± 20%

with 50pf pad loading at 2.0MHz CPU frequency.

PB7 can be a PWM waveform output. PB6 can be an external

clock or event input for Timer2. PB5 is used as external interrupt

input with falling-edge trigger.

PB4 can be used as external

active-low reset input by enabling the configurable option. PB0

can be reference voltage input for Comparator function. In case

of using PB0 as external reference voltage input, the resistive

pull-up/down should be disabled. The more details are described

in related sections.

The corresponding pads are assigned for SPMC802B as following: (VDD = 5.0V)

OUT

Special Function

PB7

100K Up/Down@rpb7

8/8mA

PWM waveform output

PB6

100K Up/Down@rpb6

8/8mA

External clock/event input

PB5

No Pull-Up/Down

Schmitt-Trigger

-/8mA

IRQ0 interrupt input

PB4

100K Up@rpb4

Schmitt-Trigger

8/8mA

External nRESET input

PB3

100K Up/Down@rpb3

8/8mA

PB2

100K Up@rpb2

-/20mA

PB1

100K Up@rpb1

-/20mA

PB0

100K Up/Down@rpb0

8/8mA

Comparator Vref input

5.3. Port C Group

The I/O port C has 8 programmable I/Os that are controlled by

data register PC, direction control register DPC, and pull-up/down

resistance control register RPC. DPC is used to control the pad

I/O attribute.

Setting the bit(s) to '1' will enforce the

corresponding pad(s) to output mode. It is a write-only register.

PC is used to store the data contents for output. Reading PC will

get the stored data when corresponding bit of DPC is set as output

mode, or will get the pad status if it is in input mode.

There is a built-in Pull-Up/Down resistor on each pad. These

pull-up/down resistors should be selected either pull-up or

pull-down by configurable option first, and then can be controlled

by users' program through RPC.

PC7:0 are used as external interrupt inputs. The more details are

described in section Interrupt.

The corresponding pads are assigned for SPMC802B as following: (VDD = 5.0V)

OUT

Special Function

PC7

100K Up/Down@rpc7

8/8mA

IRQ2 interrupt input

PC6

100K Up/Down@rpc6

8/8mA

IRQ2 interrupt input

PC5

100K Up/Down@rpc5

8/8mA

IRQ2 interrupt input

PC4

100K Up/Down@rpc4

8/8mA

IRQ2 interrupt input

PC3

100K Up/Down@rpc3

8/8mA

IRQ2 interrupt input

PC2

100K Up/Down@rpc2

8/8mA

IRQ2 interrupt input

PC1

100K Up/Down@rpc1

8/8mA

IRQ2 interrupt input

PC0

100K Up/Down@rpc0

8/8mA

IRQ2 interrupt input

Proprietary & Confidential

AUG. 07, 2002

Version: 1.0

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