SC9RS08KA2 datasheet(89/134 Pages) FREESCALE

89 / 134 page

SC9RS08KA2 Series Data Sheet, Rev. 1

Freescale Semiconductor

Chapter 11

Modulo Timer (RS08MTIMV1)

11.1

Introduction

The MTIM is a simple 8-bit timer with several software selectable clock sources and a programmable

interrupt.

The central component of the MTIM is the 8-bit counter that can operate as a free-running counter or a

modulo counter. A timer overflow interrupt can be enabled to generate periodic interrupts for time-based

software loops.

The TCLK input is connected to the PTA2 pin of the SC9RS08KA2 Series. The XCLK input is connected

to the ICSFFCLK clock divided by two, where the ICSFFCLK is the fixed-frequency internal reference

clock from the ICS module.

Figure 11-1 shows the SC9RS08KA2 Series block diagram with the MTIM highlighted.

Figure 11-1. SC9RS08KA2 Series Block Diagram Highlighting MTIM Block and Pin

RS08 CORE

USER RAM — 63 BYTES

NOTES:

(1) Pins are software configurable with pullup/pulldown device if input port.

(2) Integrated pullup device enabled if reset enabled (RSTPE=1).

(3) These pins are not available in 6-pin package

POWER AND

VSS

VDD

INTERNAL CLOCK

SOURCE

BDC

RS08 SYSTEM CONTROL

RTI

CPU

COP

WAKEUP

LVD

RESET AND STOP WAKEUP

MODES OF OPERATION

POWER MANAGEMENT

5-BIT KEYBOARD

INTERRUPT MODULE

PTA0/KBIP0/ACMP+ (1)

PTA1/KBIP1/ACMP- (1)

PTA2/KBIP2/TCLK/RESET/VPP (1),( 2)

PTA3/ACMPO/BKGD/MS

ANALOG COMPARATOR

MODULE

MODULO TIMER

MODULE

PTA4/KBIP4 (1),(3)

PTA5/KBIP5 (1), (3)

INTERNAL REGULATOR

(KBI)

TCLK

ACMP-

ACMP+

ACMPO

(ICS)

(ACMP)

(MTIM)

USER FLASH

SC9RS08KA2 — 2048 BYTES

SC9RS08KA1 — 1024 BYTES

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