MC68HC908GT8CFB Freescale Semiconductor, MC68HC908GT8CFB Datasheet - Page 181

• Manufacturer Part Number: MC68HC908GT8CFB
• Description: IC MCU 8K FLASH 8MHZ 44-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

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: -

15.2 SIM Bus Clock Control and Generation
The bus clock generator provides system clock signals for the CPU and peripherals on the MCU. The
system clocks are generated from an incoming clock, CGMOUT, as shown in
originates from either an external oscillator or from the internal clock generator.
15.2.1 Bus Timing
In user mode, the internal bus frequency is the internal clock generator output (CGMXCLK) divided by
four.
Freescale Semiconductor
Addr.
$FE03
$FE04
$FE05
$FE06
GENERATOR
Register Name
SIM Break Flag Control
ICG
Register (SBFCR)
Register 1 (INT1)
Register 2 (INT2)
Register 3 (INT3)
Interrupt Status
Interrupt Status
Interrupt Status
See page 195.
See page 189.
See page 190.
See page 190.
ECLK
ICLK
MC68HC908GT16 • MC68HC908GT8 • MC68HC08GT16 Data Sheet, Rev. 5.0
Figure 15-2. SIM I/O Register Summary (Continued)
CIRCUIT
SELECT
CLOCK
CS
Reset:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read:
Write:
Write:
Write:
Write:
ICG
MONITOR MODE
Figure 15-3. System Clock Signals
USER MODE
BCFE
Bit 7
IF14
IF6
R
R
R
0
0
0
0
0
÷ 2
= Unimplemented
IF13
IF5
R
R
R
R
6
0
0
0
0
A
B S*
*WHEN S = 1,
CGMOUT = B
IF12
IF4
5
R
R
R
R
0
0
0
0
CGMXCLK
CGMOUT
COPCLK
TBMCLK
IF11
IF3
4
R
R
R
R
R
0
0
0
0
= Reserved
SIM Bus Clock Control and Generation
IF10
IF2
3
R
R
R
R
0
0
0
0
COP PRESCALER
TBM PRESCALER
÷ 2
SIM COUNTER
SIM
Figure
IF1
IF9
2
R
R
R
R
0
0
0
0
GENERATORS
BUS CLOCK
15-3. This clock
IF16
IF8
1
R
R
R
R
0
0
0
0
Bit 0
IF15
IF7
R
R
R
R
0
0
0
0
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