MC68HC908GT8CFB Freescale Semiconductor, MC68HC908GT8CFB Datasheet - Page 217
MC68HC908GT8CFB
Manufacturer Part Number
MC68HC908GT8CFB
Description
IC MCU 8K FLASH 8MHZ 44-QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908GT8CFBE.pdf
(292 pages)
Specifications of MC68HC908GT8CFB
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
34
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Available stocks
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Chapter 17
Timebase Module (TBM)
17.1 Introduction
This section describes the timebase module (TBM). The TBM will generate periodic interrupts at user
selectable rates using a counter clocked by the external crystal clock. This TBM version uses 15 divider
stages, eight of which are user selectable.
17.2 Features
Features of the TBM include:
17.3 Functional Description
This module can generate a periodic interrupt by dividing the clock TBMCLK. The counter is initialized to
all 0s when TBON bit is cleared. The counter, shown in
is set. When the counter overflows at the tap selected by TBR2:TBR0, the TBIF bit gets set. If the TBIE
bit is set, an interrupt request is sent to the CPU. The TBIF flag is cleared by writing a 1 to the TACK bit.
The first time the TBIF flag is set after enabling the timebase module, the interrupt is generated at
approximately half of the overflow period. Subsequent events occur at the exact period.
Freescale Semiconductor
•
•
Software programmable 1-Hz, 4-Hz, 16-Hz, 256-Hz, 512-Hz, 1024-Hz, 2048-Hz, and 4096-Hz
periodic interrupt using external 32.768-kHz crystal
User selectable oscillator clock source enable during stop mode to allow periodic wakeup from stop
MC68HC908GT16 • MC68HC908GT8 • MC68HC08GT16 Data Sheet, Rev. 5.0
This module is designed for a 32.768-kHz oscillator.
NOTE
Figure
17-1, starts counting when the TBON bit
217
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