Samsung S3C8837, S3C8835, S3P8837 Datasheet

S3C8835/C8837/P8837 PRODUCT OVERVIEW

1 PRODUCT OVERVIEW

SAM87 PRODUCT FAMILY

Samsung's SAM87 family of 8-bit single-chip CMOS microcontrollers offers a fast and efficient CPU, a wide
range of integrated peripherals, and various mask-programmable ROM sizes. Important CPU features include:

— Efficient register-oriented architecture
— Selectable CPU clock sources
— Release by interrupt of Idle and Stop power-down modes
— Built-in basic timer circuit with watchdog function

A sophisticated interrupt structure recognizes up to eight interrupt levels. Each level can have one or more
interrupt sources and vectors. Fast interrupt processing (within a minimum six CPU clocks) can be assigned to
specific interrupt levels.

S3C8835/C8837/P8837

The S3C8835 microcontroller has 16 K bytes of on-chip program memory and the S3C8837 has 24 K bytes. Both
chips have a 272-byte general-purpose internal register file. The interrupt structure has seven interrupt sources
with six interrupt vectors. The CPU recognizes six interrupt priority levels.

Using a modular design approach, the following peripherals were integrated with the SAM87 core to make the
S3C8835/C8837/P8837 suitable for use in color television and other types of screen display applications:

— Four programmable I/O ports (26 pins total: 16 general-purpose I/O pins; 8 n-channel, open-drain output pins)
— 2 channel A/D converter (4-bit resolution)
— 14-bit PWM output (one channels: push-pull type)
— Basic timer (BT) with watchdog timer function
— One 8-bit timer/counter (T0) with interval timer
— One 8-bit general-purpose timer/counter (TA) with prescalers
— On-screen display (OSD) with a wide range of programmable features including halftone control signal output

The S3C8835/C8837 are available in a versatile 42-pin SDIP package.

OTP

The S3C8835/C8837 microcontroller is also available in OTP (One Time Programmable) version, S3P8837.
S3P8837 microcontroller has an on-chip 24K-byte one-time-programmable EPROM instead of masked ROM.
The S3P8837 is comparable to S3C8835/C8837, both in function and in pin configuration.

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PRODUCT OVERVIEW S3C8835/C8837/P8837

FEATURES

CPU

• SAM87 CPU core

Memory

• 16-K byte (S3C8835) or 24K- byte (S3C8837)
internal program memory

• 272-byte general-purpose register area

Instruction Set

• 78 instructions

• IDLE and STOP instructions added for power­down modes

Instruction Execution Time

• 750 ns (minimum) with an 8-MHz CPU clock

Interrupts

• 7 interrupt sources with 6 vectors

• 6 interrupt levels

• Fast interrupt processing for select levels

General I/O

Pulse Width Modulation Module

• 14-bit PWM with one-channel output (push-pull
type)

• PWM counter and data capture input pin

• Frequency: 5.859 kHz to 23.437 kHz with a
6-MHz CPU clock

On-Screen Display (OSD)

• Video RAM: 252 × 12 bits

• Character generator ROM: 256 × 18 × 16 bits
(256 display characters: fixed: 2, variable: 254)

• 252 display positions (12 rows × 21 columns)

• 16-dot × 18-dot character resolution

• 16 different character sizes

• Eight character colors

• Vertical direction fade-in/fade-out control

• Eight colors for character and frame background

• Halftone control signal output; selectable for
individual characters

• Synchronous polarity selector for H-sync and
V-sync input

• Four I/O ports (26 pins total)

• Six open-drain pins for up to 6-volt loads

• Two open-drain pins for up to 5-volt loads

8-Bit Basic Timer

• Three selectable internal clock frequencies

• Watchdog or oscillation stabilization function

Timer/Counters

• One 8-bit timer/counter (T0) with three internal
clocks and interval timer mode.

• One general-purpose 8-bit timer/counters with
interval timer mode (timer A)

A/D Converter

• Two analog input pins; 4-bit resolution

• 3.125 µs conversion time (8-MHz CPU clock)

Oscillator Frequency

• 5-MHz to 8-MHz external crystal oscillator

• Maximum 8-MHz CPU clock

Operating Temperature Range

• – 20°C to + 85°C

Operating Voltage Range

• 4.5 V to 5.5 V

Package Type

• 42-pin SDIP

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S3C8835/C8837/P8837 PRODUCT OVERVIEW

BLOCK DIAGRAM

X

OSC

OSC

H-sync

V-sync

Vgreen

Vblue

Vblank

OSDHT

ADC0
ADC1

X

IN

OUT

IN

OUT

Vred

RESET

INT0 - INT1

MAIN

OSC

L-C OSC

ON-

SCREEN

DISPLAY

4-BIT

ADC

P0.0 - P0.7

PORT 0 PORT 1

SAM87 BUS

PORT I/O and INTERRUPT

CONTROL

SAM87 CPU

16KB ROM (8835)

24KB ROM (8837)

SAM87 BUS

P1.0 - P1.7

272-BYTE

REGISTER FILE

TEST

TIMER A

TIMER 0

PWM

BLOCK

PWM

COUNTER

and DATA

CAPTURE

14-BIT

PWM

CAPA

PWM0

PORT 2

P2.0 - P2.7

Figure 1-1. Block Diagram

PORT 3

P3.0 - P3.1

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PRODUCT OVERVIEW S3C8835/C8837/P8837

PIN ASSIGNMENTS

P2.5/PWM0

P2.1

P2.2(

SCL

P2.3(

SDA

P2.4
P2.0
P2.6

P1.7
P3.0/ADC0
P3.1/ADC1

P0.6

P0.7

TEST

P1.0/INT0
P1.1/INT1

P1.2

P1.3

P1.4

P1.5

P1.6

P2.7/OSDHT

1
2

)

3

)

4
5
6
7
8
9
10
11
12
13

S3C8835
S3C8837

42-PIN SDIP

(Top View)

14
15
16
17
18
19
20
21

42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22

P0.0
P0.1
P0.2
P0.3
P0.4
V

SS2

CAPA
P0.5
V

DD

RESET

X

OUT

X

IN

V

SS1

OSC

OUT

OSC

IN

V-sync
H-sync
Vblank
Vred
Vgreen
Vblue

1-4

Figure 1-2. S3C8835/C8837/P8837 Pin Assignment Diagram

S3C8835/C8837/P8837 PRODUCT OVERVIEW

Table 1-1. S3C8835/C8837 Pin Descriptions

Pin Name Pin

Pin Description Circuit

Type

P0.0–P0.7 I/O General I/O port (8-bit), configurable for

digital input or push-pull output.

P1.0–P1.1 I/O General I/O port (2-bit), configurable for

digital input or n-channel open-drain output.
P1.0–P1.1 can withstand up to 6-volt loads.
Multiplexed for alternative use as external
interrupt inputs INT0–INT1.

P1.2–P1.5 General I/O port (4-bit), configurable for

digital input or n-channel open-drain output.
P1.2–P1.5 can withstand up to 6-volt loads.
High current port (10mA).

P1.6–P1.7 General I/O port (2-bit), configurable for

digital input or push-pull output.

P2.0–P2.4,
P2.6

I/O General I/O port (6-bit). I/O mode or

n-channel open-drain, push-pull output
mode is software configurable. Pins can
withstand up to 5-volt loads.
P2.2: OTP serial clock pin
P2.3: OTP serial data pin

P2.5, P2.7 General I/O port (2-bit). I/O mode or

n-channel open-drain, push-pull output
mode is software configurable. Pins can
withstand up to 5-volt loads.

Each pin has an alternative function.
P2.5: PWM0 (14-bit PWM output)
P2.7: OSDHT (Halftone signal output)

Type

Pin

Numbers

Share

Pins

3 11–12, 35,

38–42

7 14–15 INT0–INT1

5 16–19

3 20, 8

2 2–7

2 1, 21 PWM0

OSDHT

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PRODUCT OVERVIEW S3C8835/C8837/P8837

Table 1-1. S3C8835/C8837 Pin Descriptions (Continued)

Pin Name Pin

Type

P3.0–P3.1 I/O General I/O port (2 bits), configurable for

digital input or n-channel open-drain output.

Pin Description Circuit

Type

6 9–10 ADC0

Pin

Numbers

Share

Pins

ADC1
P3.0–P3.1 can withstand up to 5-volt loads.
Multiplexed for alternative use as external
interrupt inputs ADC0–ADC1.

PWM0 O Output pin for 14-bit PWM0 circuit 2 1 P2.5
ADC0–ADC1 I Analog inputs for 4-bit A/D converter 6 9,10 P3.0–

P3.1

INT0–INT1 I External interrupt input pins 7 14,15 P1.0–

P1.1
OSDHT O Halftone control signal output for OSD 2 21 P2.7
Vblue, Vgreen

Vred, Vblank

O Digital blue, green, red, and video blank

signal outputs for OSD

4 22–25 –

H-sync I H-sync input for OSD 8 26 –
V-sync V-sync input for OSD 27
OSC

IN,

OSC

OUT

I, O L-C oscillator pins for OSD clock frequency

– 28,29 –

generation

TEST I

0 V: Normal operation mode

– 13 –

5 V: Factory test mode

12.5 V: OTP write mode

X

IN, XOUT

RESET

V

DD, VSS1, VSS2

I, O System clock pins – 31, 32 –

I System reset input pin 1 33 –

– Power supply pins – 13 –

CAPA I Input for capture A module 8 26 –

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