S9S12P64J0CFT Freescale Semiconductor, S9S12P64J0CFT Datasheet - Page 383
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S9S12P64J0CFT
Manufacturer Part Number
S9S12P64J0CFT
Description
16-bit Microcontrollers - MCU 16-bit 64K Flash
Manufacturer
Freescale Semiconductor
Datasheet
1.MC9S12P64VQK.pdf
(566 pages)
Specifications of S9S12P64J0CFT
Rohs
yes
Core
S12
Processor Series
MC9S12P
Data Bus Width
16 bit
Maximum Clock Frequency
25 MHz
Program Memory Size
64 KB
Data Ram Size
4 KB
On-chip Adc
Yes
Operating Supply Voltage
3.15 V to 5.5 V
Operating Temperature Range
- 40 C to + 125 C
Package / Case
QFN-48
Mounting Style
SMD/SMT
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When the transmit shift register is not transmitting a frame, the TXD pin goes to the idle condition, logic
1. If at any time software clears the TE bit in SCI control register 2 (SCICR2), the transmitter enable signal
goes low and the transmit signal goes idle.
If software clears TE while a transmission is in progress (TC = 0), the frame in the transmit shift register
continues to shift out. To avoid accidentally cutting off the last frame in a message, always wait for TDRE
to go high after the last frame before clearing TE.
To separate messages with preambles with minimum idle line time, use this sequence between messages:
11.4.5.3
Writing a logic 1 to the send break bit, SBK, in SCI control register 2 (SCICR2) loads the transmit shift
register with a break character. A break character contains all logic 0s and has no start, stop, or parity bit.
Break character length depends on the M bit in SCI control register 1 (SCICR1). As long as SBK is at logic
1, transmitter logic continuously loads break characters into the transmit shift register. After software
clears the SBK bit, the shift register finishes transmitting the last break character and then transmits at least
one logic 1. The automatic logic 1 at the end of a break character guarantees the recognition of the start bit
of the next frame.
The SCI recognizes a break character when there are 10 or 11(M = 0 or M = 1) consecutive zero received.
Depending if the break detect feature is enabled or not receiving a break character has these effects on SCI
registers.
If the break detect feature is disabled (BKDFE = 0):
If the break detect feature is enabled (BKDFE = 1) there are two scenarios
The break is detected right from a start bit or is detected during a byte reception.
1. A Break character in this context are either 10 or 11 consecutive zero received bits
Freescale Semiconductor
1. Write the last byte of the first message to SCIDRH/L.
2. Wait for the TDRE flag to go high, indicating the transfer of the last frame to the transmit shift
3. Queue a preamble by clearing and then setting the TE bit.
4. Write the first byte of the second message to SCIDRH/L.
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register.
Sets the framing error flag, FE
Sets the receive data register full flag, RDRF
Clears the SCI data registers (SCIDRH/L)
May set the overrun flag, OR, noise flag, NF, parity error flag, PE, or the receiver active flag, RAF
(see 3.4.4 and 3.4.5 SCI Status Register 1 and 2)
Sets the break detect interrupt flag, BLDIF
Does not change the data register full flag, RDRF or overrun flag OR
Does not change the framing error flag FE, parity error flag PE.
Does not clear the SCI data registers (SCIDRH/L)
May set noise flag NF, or receiver active flag RAF.
Break Characters
S12P-Family Reference Manual, Rev. 1.13
Serial Communication Interface (S12SCIV5)
1
383
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