S9S12GN16F0VLF Freescale Semiconductor, S9S12GN16F0VLF Datasheet - Page 300
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S9S12GN16F0VLF
Manufacturer Part Number
S9S12GN16F0VLF
Description
16-bit Microcontrollers - MCU 16-bit16k Flash 2k RAM
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S12G96F0CLL.pdf
(1292 pages)
Specifications of S9S12GN16F0VLF
Rohs
yes
Core
S12
Processor Series
MC9S12G
Data Bus Width
16 bit
Maximum Clock Frequency
25 MHz
Program Memory Size
16 KB
Data Ram Size
1024 B
On-chip Adc
Yes
Operating Supply Voltage
3.13 V to 5.5 V
Operating Temperature Range
- 40 C to + 85 C
Package / Case
TSSOP-20
Mounting Style
SMD/SMT
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Background Debug Module (S12SBDMV1)
earlier. Synchronization between the host and target is established in this manner at the start of every bit
time.
Figure 7-7
target system. The host is asynchronous to the target, so there is up to a one clock-cycle delay from the
host-generated falling edge to where the target recognizes this edge as the beginning of the bit time. Ten
target clock cycles later, the target senses the bit level on the BKGD pin. Internal glitch detect logic
requires the pin be driven high no later that eight target clock cycles after the falling edge for a logic 1
transmission.
Since the host drives the high speedup pulses in these two cases, the rising edges look like digitally driven
signals.
The receive cases are more complicated.
system. Since the host is asynchronous to the target, there is up to one clock-cycle delay from the
host-generated falling edge on BKGD to the perceived start of the bit time in the target. The host holds the
BKGD pin low long enough for the target to recognize it (at least two target clock cycles). The host must
release the low drive before the target drives a brief high speedup pulse seven target clock cycles after the
perceived start of the bit time. The host should sample the bit level about 10 target clock cycles after it
started the bit time.
302
Start of Bit Time
(Target MCU)
BDM Clock
Transmit 1
Transmit 0
Perceived
shows an external host transmitting a logic 1 and transmitting a logic 0 to the BKGD pin of a
Host
Host
Synchronization
Uncertainty
Figure 7-7. BDM Host-to-Target Serial Bit Timing
MC9S12G Family Reference Manual,
Figure 7-8
10 Cycles
shows the host receiving a logic 1 from the target
Target Senses Bit
Rev.1.23
Freescale Semiconductor
Next Bit
Earliest
Start of
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