MC68HC908AP64CB Freescale Semiconductor, MC68HC908AP64CB Datasheet - Page 53

• Manufacturer Part Number: MC68HC908AP64CB
• Description: IC MCU 64K FLASH 8MHZ 42SDIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908AP64CB

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, IRSCI, SCI, SPI
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 30
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 42-DIP (0.600", 15.24mm)
• For Use With: DEMO908AP64E - BOARD DEMO FOR 908AP64DEMO908AP64 - BOARD DEMO FOR 908AP64
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

SCIBDSRC — SCI Baud Rate Clock Source
3.5 Mask Option Register (MOR)
The mask option register (MOR) is used for selecting one of the three clock options for the MCU. The
MOR is a byte located in FLASH memory, and is written to by a FLASH programming routine.
OSCSEL1, OSCSEL0 — Oscillator Selection Bits
Bits 5–0 — Should be left as 1’s
Freescale Semiconductor
SCIBDSRC selects the clock source used for the standard SCI module (non-infrared SCI). The setting
of this bit affects the frequency at which the SCI operates.
OSCSEL1 and OSCSEL0 select which oscillator is used for the MCU CGMXCLK clock. The erase
state of these two bits is logic 1. These bits are unaffected by reset. (See
OSCSEL1
1 = Internal data bus clock, f
0 = Oscillator clock, CGMXCLK, is used as clock source for SCI
0
0
1
1
Address:
The internal oscillator is a free running oscillator and is available after each
POR or reset. It is turned-off in stop mode by setting the STOP_ICLKDIS
bit in CONFIG2.
Erased:
Reset:
Read:
Write:
OSCSEL0
OSCSEL1 OSCSEL0
0
1
0
1
$FFCF
Bit 7
R
1
Figure 3-4. Mask Option Register (MOR)
Table 3-1. CGMXCLK Clock Selection
CGMXCLK
6
1
MC68HC908AP Family Data Sheet, Rev. 4
RCCLK
BUS
X-TAL
= Reserved
ICLK
—
, is used as clock source for SCI
R
5
1
output of XTAL
OSC2 pin
Inverting
NOTE
Unaffected by reset
f
f
BUS
BUS
—
R
4
1
R
3
1
Not used
Internal oscillator generates the CGMXCLK.
RC oscillator generates the CGMXCLK.
Internal oscillator is available after each POR
or reset.
X-tal oscillator generates the CGMXCLK.
Internal oscillator is available after each POR
or reset.
R
2
1
Table
Comments
R
1
1
Mask Option Register (MOR)
3-1).
Bit 0
R
1
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