
MOTOROLA
MC68HC916X1
18
MC68HC916X1TS/D
3.2.2 16-Bit Expanded Mode
In 16-bit expanded mode, (BERR = 1, DATA1 = 0) pins ADDR[18:3] and DATA[15:0] are configured
as address and data pins, respectively. The alternate functions for these pins as ports A, B, G, and
H are unavailable. Table 11 is a summary of pin function options for 16-bit data bus operation.
3.2.3 8-Bit Expanded Mode
In 8-bit expanded mode (BERR = 1, DATA1 = 1), pins DATA[7:0] are configured as an 8-bit I/O port.
Pins DATA[15:8] are configured as data pins. Pins ADDR[18:3] are configured as address pins.
Emulator mode is always disabled. Table 12 is a summary of pin function selections for 8-bit data
bus operation.
1. CS[9:7] outputs are not available on the MC68HC916X1. Corresponding pin assignment register fields
(CSPA1[3:1]) are affected by the state of DATA[6:4] during reset.
2. CSE
is enabled when DATA10 and DATA1 = 0 during reset.
3. CSM
is enabled when DATA13, DATA10 and DATA1 = 0 during reset.
4. DATA11 must remain high during reset to ensure normal operation of MCU.
5. Driven to put BEFLASH in STOP mode. STOP mode disabled when DATA15 is held high and STOP shad-
ow bit is cleared.
Table 11 16-Bit Expanded Mode Reset Configuration
Pin(s) Affected
Select Pin
Default Function
(Pin Held High)
Alternate Function
(Pin Held Low)
BR/CS0
FC0/CS3/PC0
FC1/PC1
FC2/CS5/PC2
DATA2
CS0
CS3
FC1
CS5
BR
FC0
FC1
FC2
ADDR19/CS6/PC3
ADDR23/CS10/ECLK
DATA31
CS6
CS10
ADDR19
ADDR23
DSACK1/PE1
DS/PE4
AS/PE5
SIZ0/PE6
SIZ1/PE7
DATA8
DSACK1
DS
AS
SIZ0
SIZ1
PE1
PE4
PE5
PE6
PE7
MODCLK/PF0
IRQ[7:6]/PF[7:6]
DATA9
MODCLK
IRQ[7:6]
PF0
PF[7:6]
BGACK/CSE
BG/CSM
DATA10
BGACK
BG
CSE2
CSM3
Reserved
DATA114
Normal Operation
Reserved
Emulation Mode (SCIM)
DATA10
Disabled
Enabled
STOP Mode (BEFLASH)
DATA15
Array Enabled5
Array Disabled
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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