MC68376BGMAB20 Freescale Semiconductor, MC68376BGMAB20 Datasheet - Page 148

• Manufacturer Part Number: MC68376BGMAB20
• Description: IC MCU 32BIT 8K ROM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68376BGMAB20

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CAN, EBI/EMI, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Type: ROMless
• Ram Size: 7.5K x 8
• Voltage - Supply (vcc/vdd): 4.75 V ~ 5.25 V
• Data Converters: A/D 16x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 160-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

7.3 MRM Array Address Space Type
7.4 Normal Access
7-2
MOTOROLA
ASPC[1:0] in MRMCR determines ROM array address space type. The module can
respond to both program and data space accesses or to program space accesses
only. This allows code to be executed from ROM, and permits use of program counter
relative addressing mode for operand fetches from the array. The default value of
ASPC[1:0] is established during mask programming, but field value can be changed
after reset if the LOCK bit in the MRMCR has not been masked to a value of one.
Table 7-1 shows ASPC[1:0] field encodings.
Refer to 4.5 Addressing Modes for more information on addressing modes. Refer to
5.5.1.7 Function Codes for more information concerning address space types and
program/data space access.
The array can be accessed by byte, word, or long word. A byte or aligned word access
takes a minimum of one bus cycle (two system clocks). A long word access requires
two bus cycles. Misaligned accesses are not permitted by the CPU32 and will result in
an address error exception.
Access time can be optimized for a particular application by inserting wait states into
each access. The number of wait states inserted is determined by the value of
WAIT[1:0] in the MRMCR. Two, three, four, or five bus-cycle accesses can be speci-
fied. The default value WAIT[1:0] is established during mask programming, but field
value can be changed after reset if the LOCK bit in the MRMCR has not been masked
to a value of one.
Table 7-2 shows WAIT[1:0] field encodings.
Refer to 5.6 Bus Operation for more information concerning access times.
ASPC[1:0]
Table 7-1 ROM Array Space Type
WAIT[1:0]
00
01
10
11
00
01
10
11
Table 7-2 Wait States Field
MASKED ROM MODULE
Unrestricted program and data
Supervisor program and data
Cycles per Transfer
Unrestricted program
Supervisor program
State Specified
3
4
5
2
USER’S MANUAL
MC68336/376