PXS20RM Datasheet, PDF (768/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

FlexRay Communication Controller
26.5.2.46 Slot Status Selection Register (FR_SSSR)
Base + 0x0064
16-bit write access required
Write: Anytime
0
1
R0 0
W WMD
Rese
t
0
0
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
SEL
SLOTNUMBER
00000000000000
Figure 26-46. Slot Status Selection Register (FR_SSSR)
This register is used to access the four internal non memory-mapped slot status selection registers
FR_SSSR0 to FR_SSSR3. Each internal registers selects a slot, or symbol window/NIT, whose status
vector will be saved in the corresponding Slot Status Registers (FR_SSR0–FR_SSR7) according to
Table 26-53. For a detailed description of slot status monitoring, refer to Section 26.6.18, Slot Status
Monitoring.
Table 26-52. FR_SSSR Field Descriptions
Field
Description
WMD
Write Mode — This control bit defines the write mode of this register.
0 Write to all fields in this register on write access.
1 Write to SEL field only on write access.
SEL
Selector — This field selects one of the four internal slot status selection registers for access.
00 select FR_SSSR0.
01 select FR_SSSR1.
10 select FR_SSSR2.
11 select FR_SSSR3.
SLOTNUMBER Slot Number — This field specifies 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 26-53. Mapping Between FR_SSSRn and FR_SSRn
Internal Slot Status
Selection Register
FR_SSSR0
FR_SSSR1
FR_SSSR2
FR_SSSR3
Write the Slot Status of the Slot Selected by FR_SSSRn for each
Even Communication Cycle
Odd Communication Cycle
For Channel B
to
FR_SSR0[15:8]
FR_SSR2[15:8]
FR_SSR4[15:8]
FR_SSR6[15:8]
For Channel A
to
FR_SSR0[7:0]
FR_SSR2[7:0]
FR_SSR4[7:0]
FR_SSR6[7:0]
For Channel B
to
FR_SSR1[15:8]
FR_SSR3[15:8]
FR_SSR5[15:8]
FR_SSR7[15:8]
For Channel A
to
FR_SSR1[7:0]
FR_SSR3[7:0]
FR_SSR5[7:0]
FR_SSR7[7:0]
26-56
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor