S912XEP768J5MAGR Freescale Semiconductor, S912XEP768J5MAGR Datasheet - Page 584
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S912XEP768J5MAGR
Manufacturer Part Number
S912XEP768J5MAGR
Description
16-bit Microcontrollers - MCU 16-bit 768K Flash
Manufacturer
Freescale Semiconductor
Datasheet
1.S912XEG128J2MAL.pdf
(1324 pages)
Specifications of S912XEP768J5MAGR
Rohs
yes
Core
HCS12X
Processor Series
MC9S12
Data Bus Width
16 bit
Maximum Clock Frequency
50 MHz
Program Memory Size
768 KB
Data Ram Size
48 KB
On-chip Adc
Yes
Operating Supply Voltage
3.3 V to 5 V
Operating Temperature Range
- 40 C to + 125 C
Package / Case
LQFP-144
Mounting Style
SMD/SMT
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
S912XEP768J5MAGR
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Chapter 15 Inter-Integrated Circuit (IICV3) Block Description
The equation used to generate the divider values from the IBFD bits is:
The SDA hold delay is equal to the CPU clock period multiplied by the SDA Hold value shown in
Table
The equation for SCL Hold values to generate the start and stop conditions from the IBFD bits is:
584
MUL=1
SCL
SDA
15-7. The equation used to generate the SDA Hold value from the IBFD bits is:
SCL Divider = MUL x {2 x (scl2tap + [(SCL_Tap -1) x tap2tap] + 2)}
SDA Hold = MUL x {scl2tap + [(SDA_Tap - 1) x tap2tap] + 3}
SCL Hold(start) = MUL x [scl2start + (SCL_Tap - 1) x tap2tap]
SCL Hold(stop) = MUL x [scl2stop + (SCL_Tap - 1) x tap2tap]
IBC[7:0]
(hex)
00
01
02
03
04
05
A master SCL divider period can be prolonged at higher internal bus
frequencies. This happens when the internal bus cycle length becomes equal
to a pad delay. The SCL input is used for clock arbitration of multiple
masters. Thus after each SCL edge is internally driven an extra bus period
is counted before the pad level is attained, allowing the next toggle. This has
the effect of extending the SCL Divider values in
and IBC[7:0] = 0x00 to 0x0F.
START condition
Table 15-7. IIC Divider and Hold Values (Sheet 1 of 6)
SCL Divider
(clocks)
MC9S12XE-Family Reference Manual Rev. 1.25
20
22
24
26
28
30
Figure 15-5. SCL Divider and SDA Hold
SCL Hold(start)
NOTE
SDA Hold
(clocks)
7
7
8
8
9
9
Table 15-7
STOP condition
SCL Hold
(start)
10
11
6
7
8
9
for MUL=1
Freescale Semiconductor
SCL Hold(stop)
SCL Hold
(stop)
11
12
13
14
15
16
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