SPMC802B datasheet(7/27 Pages) ETC

7 / 27 page

SPMC802B

5. FUNCTIONAL DESCRPITIONS

SPMC802B is an OTP for SPMC02A emulating. The functional

blocks have two kinds of control input.

The first one is

configurable option.

The other is programmable register.

Configurable options are used as permanent assignment. They

are configured with the program code in the same time. Once

the configurable options are written to SPMC802B, they are

unchangeable as the program code. The configurable options

are described in detail later. Programmable registers are used to

control the functional blocks by the program. The program can

access the registers to achieve the desire functions.

There are two kinds of registers with different access methods.

The first kind of registers uses direct access as normal. The

second kind of registers uses indexed write access for specific

function. They are summarized as following. All of the function

registers will be set to 0 (except rt1 and rt0 in

TCS1), when a reset

signal occurred. The bits rt1 and rt0 will be set to 1 when a reset

signal occurred.

5.1. Port A Group

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

data register PA, direction control register DPA, and pull-up/down

resistance control register RPA. DPA 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.

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

get the stored data when corresponding bit of DPA 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. PA7:6

have pull-up resistors that is permanent in SPMC802B. PA5:4

can be configured with pull-up or pull-down resistors.

These

configurable pull-up/down resistors should be selected or enabled

by configurable option first, and then can be controlled by users'

program through RPA.

The output mode on PA7:6 can be programmed as slow transition

outputs. Programming the bit slowe in RPA to '1' will enforce the

output high to low transition time to 250ns

± 20% with 500pf pad

loading at 2.0MHz CPU frequency.

PA7 and PA3:0 are used as external interrupt inputs. The more

details are described in section Interrupt. PA5:4 are used as

voltage compare inputs for Comparator function.

They are

analog inputs to provide source voltage inputs. The more details

are described in section Comparator.

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

OUT

Special Function

PA7

5K Up Always

Schmitt-Trigger

-/8mA

IRQ1 interrupt input

PA6

5K Up Always

Schmitt-Trigger

-/8mA

PA5

100K Up/Down@rpa5

8/8mA

CMP1 compare input

PA4

100K Up/Down@rpa4

8/8mA

CMP0 compare input

PA3

100K Up/Down@rpa3

8/8mA

IRQ0 interrupt input

PA2

100K Up/Down@rpa2

8/8mA

IRQ0 interrupt input

PA1

100K Up/Down@rpa1

8/8mA

IRQ0 interrupt input

PA0

100K Up/Down@rpa0

8/8mA

IRQ0 interrupt input

5.2. Port B Group

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

data register PB, direction control register DPB, and pull-up/down

resistance control register RPB. DPB 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.

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

get the stored data when corresponding bit of DPB 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 except PB5.

PB7, PB6, PB3, and PB0 can be configured with pull-up or

pull-down resistors.

These configurable pull-up/down resistors

should be selected by configurable option first, and then can be

controlled by users' program through RPB. PB5 does not have

the internal resistor.

For interrupt input on PB5, an external

pull-up resistor is needed to maintain the interrupt function. PB4,

PB2, and PB1 have pull-up resistors. They can be controlled by

users' program through RPB.

Proprietary & Confidential

AUG. 07, 2002

Version: 1.0

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