NXP Semiconductors MPC5644A, Reference Manual, Page: 1364 / 1735

Enhanced Serial Communication Interface (ESCI)
MPC5644A Microcontroller Reference Manual, Rev. 6
1364 Freescale Semiconductor
triggered by the module are shown in Table 31-27 . The state diagram of the transmitter is shown in
Figure 31-25 .
Figure 31-25. Transmitter State Diagram
The current state of the transmitter can be determined by the TE control bit in the Control
register 1 (eSCI_CR1) and the TACT status bit in Interrupt Flag and Status Register 1 (eSCI_IFSR1) .
The application triggers a transition described in Table 31-26 when it issues a command by writing to the
TE bit in the Control register 1 (eSCI_CR1) . The transition is triggered only if the conditions are fulfilled.
As a result of the transition the state of the transmitter is changed as shown in Figure 31-25 and the action
given in Table 31-26 is executed.
The module transition shown in Table 31-27 are triggered when the described condition or event occurs.
The send break bit SBK in the Control register 1 (eSCI_CR1) is check for the start condition. The internal
commit bit iCMT, the transmitter active bit TACT in the Interrupt Flag and Status Register 1
(eSCI_IFSR1) , the TDRE, and the TC flag in the Interrupt Flag and Status Register 1 (eSCI_IFSR1) are
changed as a action result of the transition.
Table 31-25. Transmitter States
State
Indication
Description
eSCI_CR1[TE] eSCI_IFSR1[TACT]
Idle 0 0 Transmitter is disabled and no transmission is running
Ready 1 0 Transmitter is enabled and no transmission is running
Run 1 1 Transmitter is enabled and transmission is running
Stop 0 1 Transmitter is disabled and transmission is running
Table 31-26. Transmitter Application Transitions
Transition Command Precondition Action Description
EN eSCI_CR1[TE]:=1 eSCI_CR1[TE]=0 iPRE:=1 Transmitter is enabled by application command.
DIS eSCI_CR1[TE]:=0 eSCI_CR1[TE]=1 Transmitter is disabled by application command
Ready
EN
start
Idle
RESET_STATE
Run
Stop
DIS
DIS
EN
halt
done