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T84C5112-RKSEL Datasheet(PDF) 7 Page - ATMEL Corporation

Part # T84C5112-RKSEL
Description  8-bit Microcontroller with A/D converter
Download  97 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T84C5112-RKSEL Datasheet(HTML) 7 Page - ATMEL Corporation

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Rev. B - November 10, 2000
7
Preliminary
T80C5112
6. Clock system
6.1. Overview
The T80C5112 oscillator system provides a reliable clocking system with full mastering of speed versus CPU
power trade off. Several clocks sources are possible:
· External clock input
· High speed crystal or ceramic oscillator
· Low speed crystal oscillator
· Integrated high speed RC oscillator
· The low speed RC oscillator of the watchdog is a backup clocking source when no clock are selected in active
or idle modes.
The selected clock source can be divided by 2-512 before clocking the CPU and the peripherals. When X2 function
is set, the CPU need 6 clock periods per cycle.
Active oscillator at reset is defined by bits in a configuration byte programmed on an OTP programmer or by
metal mask.
Clocking is controlled by several SFR registers : OSCON, CKCON0, CKCON1, CKRL.
6.2. Blocks description
The T80C5112 includes the following oscillators:
· Crystal oscillator, with two possible gains optimized for 32 kHz or 33 MHz.
· Integrated high speed RC oscillator, with typical frequency of 12 MHz
· Integrated low speed, low power RC oscillator, with typical frequency of 200 kHz; this oscillator is used to
clock the hardware watchdog and as back up oscillator when the CPU receives no clock signal in active or
idle modes.
6.2.1. Crystal oscillator : OSCA
The crystal oscillator uses two external pins, XTAL1 for input and XTAL2 for output.
XT_SP in configuration byte allows to select between two possible gains optimized for 32 kHz or 33 MHz. Both
crystal and ceramic resonnators can be used.
OSCAEN in OSCCON register is an enable signal for the crystal oscillator or the external oscillator input.
When the crystal oscillator is not selected, XTAL1 can be used as a standard C51 I/O port, and X2 can be used
as a standard C51 I/O port.
6.2.2. Integrated high speed RC oscillator : OSCB
The high speed RC oscillator do not need any external component; its typical frequency is 12 MHz. Note that the
on chip oscillator has a +-25% frequency tolerance and for that reason may not be suitable for use in some applications.
OSCBEN in OSCCON register is an enable signal for the high speed RC oscillator.


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