MC9S12XA512CAG Freescale Semiconductor, MC9S12XA512CAG Datasheet - Page 586
![IC MCU 512K FLASH 144-LQFP](/photos/12/38/123875/mc9s12xa512cag_sml.jpg)
MC9S12XA512CAG
Manufacturer Part Number
MC9S12XA512CAG
Description
IC MCU 512K FLASH 144-LQFP
Manufacturer
Freescale Semiconductor
Series
HCS12r
Specifications of MC9S12XA512CAG
Core Processor
HCS12X
Core Size
16-Bit
Speed
80MHz
Connectivity
EBI/EMI, I²C, IrDA, LIN, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
119
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
32K x 8
Voltage - Supply (vcc/vdd)
2.35 V ~ 5.5 V
Data Converters
A/D 24x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
144-LQFP
Processor Series
S12XA
Core
HCS12
Data Bus Width
16 bit
Data Ram Size
32 KB
Interface Type
CAN, I2C, SCI, SPI
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
119
Number Of Timers
12
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWHCS12
Development Tools By Supplier
EVB9S12XDP512E
Minimum Operating Temperature
- 40 C
On-chip Adc
2 (10 bit, 24 Channel)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Part Number:
MC9S12XA512CAG
Manufacturer:
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Quantity:
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Part Number:
MC9S12XA512CAG
Manufacturer:
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Chapter 15 Background Debug Module (S12XBDMV2)
Figure 15-10
target, there is up to a one clock-cycle delay from the host-generated falling edge on BKGD to the start of
the bit time as perceived by the target. The host initiates the bit time but the target finishes it. Since the
target wants the host to receive a logic 0, it drives the BKGD pin low for 13 target clock cycles then briefly
drives it high to speed up the rising edge. The host samples the bit level about 10 target clock cycles after
starting the bit time.
15.4.7
BDM commands that require CPU execution are ultimately treated at the MCU bus rate. Since the BDM
clock source can be asynchronously related to the bus frequency, when CLKSW = 0, it is very helpful to
provide a handshake protocol in which the host could determine when an issued command is executed by
the CPU. The alternative is to always wait the amount of time equal to the appropriate number of cycles at
the slowest possible rate the clock could be running. This sub-section will describe the hardware
handshake protocol.
The hardware handshake protocol signals to the host controller when an issued command was successfully
executed by the target. This protocol is implemented by a 16 serial clock cycle low pulse followed by a
brief speedup pulse in the BKGD pin. This pulse is generated by the target MCU when a command, issued
by the host, has been successfully executed (see
After the ACK pulse has finished: the host can start the bit retrieval if the last issued command was a read
command, or start a new command if the last command was a write command or a control command
(BACKGROUND, GO, GO_UNTIL or TRACE1). The ACK pulse is not issued earlier than 32 serial clock
cycles after the BDM command was issued. The end of the BDM command is assumed to be the 16th tick
of the last bit. This minimum delay assures enough time for the host to perceive the ACK pulse. Note also
that, there is no upper limit for the delay between the command and the related ACK pulse, since the
command execution depends upon the CPU bus frequency, which in some cases could be very slow
586
Start of Bit Time
Speedup Pulse
Target System
(Target MCU)
BDM Clock
BKGD Pin
BKGD Pin
Perceived
Drive and
Drive to
Host
Serial Interface Hardware Handshake Protocol
shows the host receiving a logic 0 from the target. Since the host is asynchronous to the
Figure 15-10. BDM Target-to-Host Serial Bit Timing (Logic 0)
MC9S12XDP512 Data Sheet, Rev. 2.21
10 Cycles
10 Cycles
Figure
15-11). This pulse is referred to as the ACK pulse.
High-Impedance
Host Samples
BKGD Pin
Speedup Pulse
Freescale Semiconductor
Next Bit
Earliest
Start of
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