S9S12P64J0MFT Freescale Semiconductor, S9S12P64J0MFT Datasheet - Page 147
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S9S12P64J0MFT
Manufacturer Part Number
S9S12P64J0MFT
Description
MCU 64K FLASH AUTO 48-QFN
Manufacturer
Freescale Semiconductor
Series
HCS12r
Datasheet
1.S9S12P32J0MFT.pdf
(566 pages)
Specifications of S9S12P64J0MFT
Core Processor
HCS12
Core Size
16-Bit
Speed
32MHz
Connectivity
CAN, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
34
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.72 V ~ 5.5 V
Data Converters
A/D 10x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
48-QFN Exposed Pad
Processor Series
S12P
Core
HCS12
3rd Party Development Tools
EWHCS12
Development Tools By Supplier
KIT33812ECUEVME, DEMO9S12PFAME
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Figure 5-11
instruction is used as an example. First, the 8-bit instruction opcode is sent by the host, followed by the
address of the memory location to be read. The target BDM decodes the instruction. A bus cycle is grabbed
(free or stolen) by the BDM and it executes the READ_BYTE operation. Having retrieved the data, the
BDM issues an ACK pulse to the host controller, indicating that the addressed byte is ready to be retrieved.
After detecting the ACK pulse, the host initiates the byte retrieval process. Note that data is sent in the form
of a word and the host needs to determine which is the appropriate byte based on whether the address was
odd or even.
Differently from the normal bit transfer (where the host initiates the transmission), the serial interface ACK
handshake pulse is initiated by the target MCU by issuing a negative edge in the BKGD pin. The hardware
handshake protocol in
should follow this timing constraint in order to avoid the risk of an electrical conflict in the BKGD pin.
The ACK handshake protocol does not support nested ACK pulses. If a BDM command is not
acknowledge by an ACK pulse, the host needs to abort the pending command first in order to be able to
issue a new BDM command. When the CPU enters wait or stop while the host issues a hardware command
(e.g., WRITE_BYTE), the target discards the incoming command due to the wait or stop being detected.
Therefore, the command is not acknowledged by the target, which means that the ACK pulse will not be
issued in this case. After a certain time the host (not aware of stop or wait) should decide to abort any
possible pending ACK pulse in order to be sure a new command can be issued. Therefore, the protocol
provides a mechanism in which a command, and its corresponding ACK, can be aborted.
Freescale Semiconductor
BKGD Pin
shows the ACK handshake protocol in a command level timing diagram. The READ_BYTE
READ_BYTE
The only place the BKGD pin can have an electrical conflict is when one
side is driving low and the other side is issuing a speedup pulse (high). Other
“highs” are pulled rather than driven. However, at low rates the time of the
speedup pulse can become lengthy and so the potential conflict time
becomes longer as well.
Host
Figure 5-10
Figure 5-11. Handshake Protocol at Command Level
Byte Address
Target
S12P-Family Reference Manual, Rev. 1.13
BDM Decodes
the Command
specifies the timing when the BKGD pin is being driven, so the host
NOTE
READ_BYTE Command
BDM Executes the
Target
BDM Issues the
ACK Pulse (out of scale)
(2) Bytes are
Retrieved
Background Debug Module (S12SBDMV1)
Host
Host
Command
New BDM
Target
147
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