S912XET256J2VAGR Freescale Semiconductor, S912XET256J2VAGR Datasheet - Page 342

• Manufacturer Part Number: S912XET256J2VAGR
• Description: 16-bit Microcontrollers - MCU Watchdog OSC/Timer -40 C to + 105 C HCS12X MCU SPI
• Manufacturer: Freescale Semiconductor

Specifications of S912XET256J2VAGR

• Core: HCS12X
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 50 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 16 KB
• On-chip Adc: Yes
• Package / Case: LQFP
• Mounting Style: SMD/SMT
• A/d Bit Size: 12 bit
• A/d Channels Available: 24
• Interface Type: CAN, SCI, SPI
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 119
• Number Of Timers: 25
• Program Memory Type: Flash
• Supply Voltage - Max: 1.98 V, 2.9 V, 5.5 V
• Supply Voltage - Min: 1.72 V, 2.7 V, 3.13 V

Chapter 8 S12X Debug (S12XDBGV3) Module
S12X tagging is disabled when the BDM becomes active. XGATE tagging is possible when the BDM is
active.
8.4.6.1
External tagging using the external TAGHI and TAGLO pins can only be used to tag CPU12X opcodes;
tagging of XGATE code using these pins is not possible. An external tag triggers the state sequencer into
state0 when the tagged opcode reaches the execution stage of the instruction queue.
The pins operate independently, thus the state of one pin does not affect the function of the other. External
tagging is possible in emulation modes only. The presence of logic level 0 on either pin at the rising edge
of the external clock (ECLK) performs the function indicated in the
bytes of an instruction word. If a taghit occurs, a breakpoint can be generated as defined by the DBGBRK
and BDM bits in DBGC1. Each time TAGHI or TAGLO are low on the rising edge of ECLK, the old tag
is replaced by a new one.
8.4.6.2
In emulation modes a low assertion of PE5/TAGLO/MODA in the 7th or 8th bus cycle after reset enables
the unconditional tagging function, allowing immediate tagging via TAGHI/TAGLO with breakpoint to
BDM independent of the ARM, BDM and DBGBRK bits. Conversely these bits are not affected by
unconditional tagging. The unconditional tagging function remains enabled until the next reset. This
function allows an immediate entry to BDM in emulation modes before user code execution. The TAGLO
assertion must be in the 7th or 8th bus cycle following the end of reset, whereby the prior RESET pin
assertion lasts the full 192 bus cycles.
8.4.7
Breakpoints can be generated as follows.
Breakpoints generated by the XGATE module or via the BDM BACKGROUND command have no affect
on the CPU12X in STOP or WAIT mode.
342
•
•
•
•
Through XGATE software breakpoint requests.
From comparator channel triggers to final state.
Using software to write to the TRIG bit in the DBGC1 register.
From taghits generated using the external TAGHI and TAGLO pins.
Breakpoints
External Tagging using TAGHI and TAGLO
Unconditional Tagging Function
MC9S12XE-Family Reference Manual Rev. 1.25
TAGHI
1
1
0
0
Table 8-47. Tag Pin Function
TAGLO
1
0
1
0
Both bytes
High byte
Low byte
No tag
Tag
Table
8-47. It is possible to tag both
Freescale Semiconductor