mc9rs08ka2 Freescale Semiconductor, Inc, mc9rs08ka2 Datasheet - Page 73

• Manufacturer Part Number: mc9rs08ka2
• Description: Rs08 Microcontrollers 8-bit Microcontroller Family
• Manufacturer: Freescale Semiconductor, Inc

Chapter 9
Internal Clock Source (RS08ICSV1)
9.1
The internal clock source (ICS) module provides clock source choices for the MCU. The module contains
a frequency-locked loop (FLL) as a clock source that is controllable by an internal reference clock. The
module can provide this FLL clock or the internal reference clock as a source for the MCU system clock,
ICSOUT.
Whichever clock source is chosen, ICSOUT is passed through a bus clock divider (BDIV), which allows
a lower final output clock frequency to be derived. ICSOUT is two times the bus frequency.
Figure 9-1
Freescale Semiconductor
V
V
DD
SS
Introduction
shows the MC9RS08KA2 Series block diagram with the ICS highlighted.
Figure 9-1. MC9RS08KA2 Series Block Diagram Highlighting ICS Block and Pins
MC9RS08KA2 — 2048 BYTES
WAKEUP
MC9RS08KA1 — 1024 BYTES
RESET AND STOP WAKEUP
BDC
RS08 SYSTEM CONTROL
USER RAM — 63 BYTES
INTERNAL REGULATOR
MODES OF OPERATION
RTI
POWER MANAGEMENT
INTERNAL CLOCK
USER FLASH
POWER AND
RS08 CORE
SOURCE
(ICS)
CPU
COP
LVD
MC9RS08KA2 Series Data Sheet, Rev. 3
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
ANALOG COMPARATOR
INTERRUPT MODULE
5-BIT KEYBOARD
MODULO TIMER
MODULE
MODULE
(ACMP)
(MTIM)
(KBI)
5
ACMPO
ACMP+
ACMP-
TCLK
PTA2/KBIP2/TCLK/RESET/V
PTA0/KBIP0/ACMP+
PTA1/KBIP1/ACMP-
PTA3/ACMPO/BKGD/MS
PTA4/KBIP4
PTA5/KBIP5
(1),(3)
(1), (3)
(1)
(1)
PP
(1),( 2)
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