MC908GR32ACFAE Freescale Semiconductor, MC908GR32ACFAE Datasheet - Page 76

• Manufacturer Part Number: MC908GR32ACFAE
• Description: IC MCU 32K FLASH 8MHZ 48-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908GR32ACFAE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 37
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 24x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Controller Family/series: HC08
• No. Of I/o's: 37
• Ram Memory Size: 1.5KB
• Cpu Speed: 8MHz
• No. Of Timers: 2
• Embedded Interface Type: SCI, SPI
• Rohs Compliant: Yes
• Processor Series: HC08GR
• Core: HC08
• Data Bus Width: 8 bit
• Data Ram Size: 1.5 KB
• Interface Type: ESCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 53
• Number Of Timers: 8
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: FSICEBASE, DEMO908GZ60E, M68CBL05CE, M68EML08GPGTE
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 24 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

Clock Generator Module (CGM)
76
10. Verify the choice of N, E, and L by comparing f
4. Select a VCO frequency multiplier, N.
5. Calculate and verify the adequacy of the VCO and bus frequencies f
6. Select the VCO’s power-of-two range multiplier E, according to
7. Select a VCO linear range multiplier, L, where f
8. Calculate and verify the adequacy of the VCO programmed center-of-range frequency, f
9. For proper operation,
In cases where desired bus frequency has some tolerance, choose f
either by other module requirements (such as modules which are clocked by CGMXCLK), cost
requirements, or ideally, as high as the specified range allows. See
Specifications. After choosing N, the actual bus frequency can be determined using equation in 2
above.
center-of-range frequency is the midpoint between the minimum and maximum frequencies
attainable by the PLL.
f
to f
VCLK
VCLK
must be within the application’s tolerance of f
.
Exceeding the recommended maximum bus frequency or VCO frequency
can crash the MCU.
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
1. Do not program E to a value of 3.
Table 4-2. Power-of-Two Range Selectors
16 MHz< f
8 MHz< f
Frequency Range
0 < f
N
L = Round
f
VRS
VCLK
=
f
VCLK
f
VCLK
f
VCLK
VRS
BUS
round
–
≤ 8 MHz
f
≤ 16 MHz
VCLK
= (L x 2
≤ 32 MHz
=
=
NOTE
⎛
⎜
⎝
( ) f
(
f
------------------------- -
N
f
VCLKDES
VCLK
≤
f
2
VCLK
RCLK
NOM
E
×
E
f
-------------------------- -
f
NOM
) f
VCLK
x f
VCLKDES
RCLK
) 4 ⁄
NOM
= 71.4 kHz
to f
NOM
2
×
⎞
⎟
⎠
VRS
2
E
, and f
and f
Table
VRS
VCLKDES
2
E
0
1
(1)
Chapter 20 Electrical
VCLK
RCLK
must be as close as possible
4-2.
. For proper operation,
to a value determined
and f
Freescale Semiconductor
BUS
.
VRS
. The