C515C_9711 Datasheet, PDF (166/268 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Components
C515C
MCU releases Buffer 2
Reset
MCU releases Buffer 1
Buffer 1 = released
Buffer 2 = released
MCU access to Buffer 2
MCU allocates Buffer 2
Store received Message
into Buffer 1
Buffer 1 = released
Buffer 2 = allocated
MCU access to Buffer 2
Store received
Message
into Buffer 1
Buffer 1 = allocated
Buffer 2 = allocated
MCU access to Buffer 2
Store received
message into
Buffer 1
MSGLST is set
MCU releases
Buffer 2
Allocated:NEWDAT = 1 OR RMTPND = 1
Released:NEWDAT = 0 AND RMTPND = 0
Buffer 1 = allocated
Buffer 2 = released
MCU access to Buffer 1
Store received
Message
into Buffer 2
Buffer 1 = allocated
Buffer 2 = allocated
MCU access to Buffer 1
MCU releases
Buffer 1
Store received
message into
Buffer 2
MSGLST is set
MCD02744
Figure 6-49
Microcontroller Handling of the Last Message Object’s Alternating Buffer
Semiconductor Group
6-103
1997-11-01