MC68302EH20C Freescale Semiconductor, MC68302EH20C Datasheet - Page 122
MC68302EH20C
Manufacturer Part Number
MC68302EH20C
Description
IC MPU MULTI-PROTOCOL 132-PQFP
Manufacturer
Freescale Semiconductor
Datasheets
1.MC68302AG20C.pdf
(4 pages)
2.MC68302AG20C.pdf
(2 pages)
3.MC68302AG20C.pdf
(13 pages)
4.MC68302EH20C.pdf
(481 pages)
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
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- MC68302AG20C PDF datasheet
- MC68302AG20C PDF datasheet #2
- MC68302AG20C PDF datasheet #3
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Communications Processor (CP)
buffer descriptors of the serial channels. Also, a number of protocol-specific parameters are
exchanged through several parameter RAM areas in the internal dual-port RAM.
The RISC controller uses the peripheral bus to communicate with all its peripherals. Each
SCC has a separate transmit and receive FIFO. Depending on the protocol chosen, the
transmit FIFO is either 3 bytes or 4 words, and the receive FIFO is either 3 bytes or 3 words.
Each SCC is configured by parameters written to the dual-port RAM and by SCC hardware
registers that are written by the M68000 core (or an external master). The SCC registers that
configure each SCC are the SCON, DSR, and SCM. There are three sets of these registers,
one for each SCC. The serial channels physical interface is configured by the M68000 core
through the SIMODE and SIMASK registers.
Simultaneous access of the dual-port RAM by the main controller and the M68000 core (or
external processor) is prevented. During a standard four-clock cycle access of the dual-port
RAM by the M68000 core, three main controller accesses are permitted. The main controller
is delayed one clock cycle, at most, in accessing the dual-port RAM.
The main controller has a priority scheduler that determines which microcode routine is
called when more than one internal request is pending. Requests are serviced in the follow-
ing priority:
4-2
1. CP or System Reset
2. SDMA Bus Error
PB8 REQUEST
CONTROLLER
RISC
CR REQUEST
SERIAL SERVICE
REQUESTS
CR
CHANNELS
SERIAL
OTHER
Figure 4-1. Simplified CP Architecture
CHANNELS
6 SDMA
FIFO
MC68302 USER’S MANUAL
SCC1
PERIPHERAL BUS
FIFO
SERIAL CHANNELS PHYSICAL INTERFACE
M68000 DATA BUS
MICROCODE
FIFO
ROM
SCC2
FIFO
FIFO
SYSTEM
RAM
SCC3
DUAL-PORT RAM
FIFO
PARAMETER
RAM
REGISTERS
REGISTERS
PHYSICAL
SCC
H/W
I/F
MOTOROLA
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