MC908AP32ACFAE Freescale Semiconductor, MC908AP32ACFAE Datasheet - Page 187
![IC MCU 32K FLASH 8MHZ 48-LQFP](/photos/37/62/376278/tqfp-48_sml.jpg)
MC908AP32ACFAE
Manufacturer Part Number
MC908AP32ACFAE
Description
IC MCU 32K FLASH 8MHZ 48-LQFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908AP16ACFBER.pdf
(316 pages)
Specifications of MC908AP32ACFAE
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, IRSCI, SCI, SPI
Peripherals
LED, LVD, POR, PWM
Number Of I /o
32
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
48-LQFP
Processor Series
HC08AP
Core
HC08
Data Bus Width
8 bit
Data Ram Size
2 KB
Interface Type
SCI, SPI
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
32
Number Of Timers
4
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Development Tools By Supplier
FSICEBASE, DEMO908AP64E, M68CBL05CE
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 8 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC908AP32ACFAE
Manufacturer:
FSC
Quantity:
15 000
Company:
Part Number:
MC908AP32ACFAE
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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12.5.3.2 Character Reception
During an SCI reception, the receive shift register shifts characters in from the RxD pin. The SCI data
register (IRSCDR) is the read-only buffer between the internal data bus and the receive shift register.
After a complete character shifts into the receive shift register, the data portion of the character transfers
to the IRSCDR. The SCI receiver full bit, SCRF, in IRSCI status register 1 (IRSCS1) becomes set,
indicating that the received byte can be read. If the SCI receive interrupt enable bit, SCRIE, in IRSCC2 is
also set, the SCRF bit generates a receiver CPU interrupt request.
12.5.3.3 Data Sampling
The receiver samples the RxD pin at the RT clock rate. The RT clock is an internal signal with a frequency
16 times the baud rate. To adjust for baud rate mismatch, the RT clock is resynchronized at the following
times (see
To locate the start bit, data recovery logic does an asynchronous search for a logic 0 preceded by three
logic 1s. When the falling edge of a possible start bit occurs, the RT clock begins to count to 16.
To verify the start bit and to detect noise, data recovery logic takes samples at RT3, RT5, and RT7.
Table 12-2
Freescale Semiconductor
•
•
RT CLOCK
RT CLOCK
SAMPLES
After every start bit
After the receiver detects a data bit change from logic 1 to logic 0 (after the majority of data bit
samples at RT8, RT9, and RT10 returns a valid logic 1 and the majority of the next RT8, RT9, and
RT10 samples returns a valid logic 0)
SCI_RxD
CLOCK
RESET
STATE
Figure
RT
summarizes the results of the start bit verification samples.
12-9):
RT3, RT5, and RT7
QUALIFICATION
START BIT
Figure 12-9. Receiver Data Sampling
MC68HC908AP A-Family Data Sheet, Rev. 3
Samples
Table 12-2. Start Bit Verification
000
001
010
VERIFICATION
START BIT
Verification
Start Bit
Yes
Yes
Yes
START BIT
SAMPLING
DATA
Noise Flag
0
1
1
SCI Functional Description
LSB
187
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