MC68F375
SINGLE-CHIP INTEGRATION MODULE 2 (SCIM2E)
MOTOROLA
REFERENCE MANUAL
Rev. 25 June 03
4-67
DATA[7:3] select in a contiguous fashion whether ADDR[23:19]/CS[10:6] serve as
high-order address lines or chip selects. Table 4-28 shows the reset correspondence
between these pins.
DATA[15:12] allow implementation dependent disabling of on-chip ROM and/or flash
EEPROM modules. Table 4-29 shows which modules on the MC68F375 are affected
by these pins.
Operation in 8-bit expanded mode is selected when BERR = 1 and DATA1 = 1 at the
release of RESET. In this configuration, ADDR[18:11]/PA[7:0] and ADDR[10:3]/
PB[7:0] become part of the address bus, and only DATA[15:8]/PG[7:0] are used for
the data bus. The ABD, RWD, and CPUD bits in SCIMMCR are clear, enabling
ADDR[2:0], R/W, and the instruction tracking pins (IPIPE/DSO and IFETCH/DSI),
respectively. Ports A, B, and G are unavailable in 8-bit expanded mode, and
DATA[7:0]/PH[7:0] serve as port H discrete I/O pins only. All remaining SCIM2E pins
Table 4-28 Reset Pin Function of CS[10:6]
Data Bus Pins at Reset
Chip-Select/Address Bus Pin Function
DATA7
DATA6
DATA5
DATA4
DATA3
CS10/
ADDR23
CS9/
ADDR22
CS8/
ADDR21
CS7/
ADDR20
CS6/
ADDR19
1
1111
CS10
CS9
CS8
CS7
CS6
1
111
0CS10
CS9
CS8
CS7
ADDR19
11
1
0X
CS10
CS9
CS8
ADDR20 ADDR19
11
0X
X
CS10
CS9
ADDR21 ADDR20 ADDR19
1
0
XXX
CS10
ADDR22 ADDR21 ADDR20 ADDR19
0
XXXX
ADDR23 ADDR22 ADDR21 ADDR20 ADDR19
Table 4-29 Reset Configuration for MC68F375 Memory Modules
Select Pin
State of Select
Pin at Rising
Edge of RESET
Memory Modules Affected
DATA10,
DATA13
0
CMFI/ROM emulation mode
1
CMFI/ROM normal mode
DATA141
NOTES:
1. The ROM can be disabled if the STOP shadow bit is programmed to one or if DATA14 is
low at the rising edge of RESET.
0
8-Kbyte Masked ROM array disabled
All four 32-Kbyte FLASH arrays disabled
1
8-Kbyte Masked ROM array enabled
All four 32-Kbyte FLASH arrays enabled
DATA152
2. The CMFI array is disabled if its STOP shadow bit is programmed to one or if DATA15 is
low at the rising edge of RESET.
0
All four 32-Kbyte CMFI FLASH blocks disabled
1
All four 32-Kbyte CMFI FLASH blocks enabled
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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