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Chapter 13 FlexRay Communication Controller (FLEXRAY)
MC9S12XF - Family Reference Manual, Rev.1.19
512
Freescale Semiconductor
This register is used to access the four internal non memory-mapped slot status selection registers SSSR0
to SSSR3. Each internal registers selects a slot, or symbol window/NIT, whose status vector will be saved
13.5.2.46 Slot Status Counter Condition Register (SSCCR)
Write: Anytime
This register is used to access and program the four internal non-memory mapped Slot Status Counter
Condition Registers SSCCR0 to SSCCR3. Each of these four internal slot status counter condition
registers denes the mode and the conditions for incrementing the counter in the corresponding
Slot StatusTable 13-53. SSSR Field Descriptions
Field
Description
15
WMD
Write Mode — This control bit denes the write mode of this register.
0 Write to all elds in this register on write access.
1 Write to SEL eld only on write access.
13–12
SEL
Selector — This eld selects one of the four internal slot status selection registers for access.
00 select SSSR0.
01 select SSSR1.
10 select SSSR2.
11 select SSSR3.
10–0
SLOTNUMBER
Slot Number — This eld species the number of the slot whose status will be saved in the corresponding
slot status registers.
Note: If this value is set to 0, the related slot status register provides the status of the symbol window after
the NIT start, and provides the status of the NIT after the cycle start.
Table 13-54. Mapping Between SSSRn and SSRn
Internal Slot
Status Selection
Register
Write the Slot Status of the Slot Selected by SSSRn for each
Even Communication Cycle
Odd Communication Cycle
For Channel B
to
For Channel A
to
For Channel B
to
For Channel A
to
SSSR0
SSR0[15:8]
SSR0[7:0]
SSR1[15:8]
SSR1[7:0]
SSSR1
SSR2[15:8]
SSR2[7:0]
SSR3[15:8]
SSR3[7:0]
SSSR2
SSR4[15:8]
SSR4[7:0]
SSR5[15:8]
SSR5[7:0]
SSSR3
SSR6[15:8]
SSR6[7:0]
SSR7[15:8]
SSR7[7:0]
Module Base + 0x0066
16-bit write access required
15
14
13
12
11
10
9876543210
R0
0
SEL
0
CNTCFG
MCY
VFR
SYF
NUF
SUF
STATUSMASK
W WMD
Reset
0000000000000000
Figure 13-46. Slot Status Counter Condition Register (SSCCR)