MC68302EH20C Freescale Semiconductor, MC68302EH20C Datasheet - Page 365

• Manufacturer Part Number: MC68302EH20C
• Description: IC MPU MULTI-PROTOCOL 132-PQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68302EH20C

• Processor Type: M683xx 32-Bit
• Speed: 20MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 132-MQFP, 132-PQFP
• Family Name: M68000
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 20MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 5V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 132
• Package Type: PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Compliant

MOTOROLA
***Now ready to go ***
***Set IMR and Enable SCC1 ***
******************************Main Routine ******************************
* Set up BD pointers
MAIN
* The following is an infinite loop that prepares data to be sent
* when a Tx BD is available to be used.
*
TxReady
Confirm
*
*Set TXBD if it is to be changed, e.g.,
*
* Mask off interrupt for the following operations
Wrapit
Umask
********************SCC1 interrupt handler ********************
* Check events:
CK_TX
BLT
DBRA
MOVE.W
MOVE.W
ORI.W
JMP
LEA.L
LEA.L
LEA.L
CLR.L
BTST.B
BNE.B
CMPI.W
BNE.B
MOVE.W
MOVE.W
BSET.B
ADDO.L
BTST.B
BNE.B
ADDQ.W
BRA.B
LEA.L
MOVE.W
JMP
ORG
CLR.L
MOVE.B
MOVE.L
ANDI.W
CMPI.W
BNE.B
MOVE.L
ANDI.W
ORI.W
Handle RX then TX then Errors
NxtBT
D1,NxtBF
#$2000,1MR
#$2000,SR
#EN_SCC,SCM1
MAIN
TXBD_01,A1
TXBD_01,A2
RXBD_01,A3
#READY,(A2)
TxReady
#$0,LN_BD(A2)
Confirm
#$5C00,ST_BD(A2)
#$2700,SR
#N_DATA,LN_BD(A2) ;Set data length to 6
#READY,ST_BD(A2)
#1,D3
#WRAP,ST_BD(A2)
Wrapit
#SZ_BD,A2
Unmask
TXBD _ 01,A2
#$2000,SR
TxReady
INT_VEC
D1
SCCE1,D1
D1,D2
#9,D2
#0,D2
RX_INT
D1,D2
#$12,D2
D3
MC68302 USER’S MANUAL
;Next Byte
;Next Buffer
;Allow SCC1 interrupt only
;Unmask interrupts
;ENT = ENR = 1
;Go to Main routine for Tx and Rx
;A1 = CTD pointer
;A2 = NTD pointer
;A3= PRD pointer
;D3 is used to count Tx frames
;Test Ready Bit
;If Ready = 0, the BD has been sent
;test NTD ->data length
;If
;Set Ready bit
;Inc Tx frame count
;Test Wrap bit
;If Wrap . 1, wrap a
;Move NTD to next BD
;Wrap back to the first TX BD
;Unmask interrupt
;Interrupt Vector for SCC1
;Clear D1
;SCCE1
;SCCE1
;Are RXF or RXB set?
;If they are set
;Handle receiver's interrupt
;SCCE1
;Are TXF or TXB set?
transmitted in the loop
confirmed
length = 0, the BD has been
, D1
, D2
, D2
MC68302 Applications
D-15