mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 158

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

5.7.4 MCU Module Pin Function During Reset
5-50
MOTOROLA
External ROM emulation is enabled by holding DATA1, DATA10, and DATA13 low
during reset (BERR must be held high during reset to enable the ROM module). While
ROM emulation mode is enabled, memory chip select signal CSM is asserted when-
ever a valid access to an address assigned to the masked ROM array is made.
The ROM module does not acknowledge IMB accesses while in emulation mode. This
causes the SCIM2 to run an external bus cycle for each access.
Usually, module pins default to port functions and input/output ports are set to input
state. This is accomplished by disabling pin functions in the appropriate control
registers and by clearing the appropriate port data direction registers. Refer to
individual module sections in this manual for more information. Table 5-20 is a
summary of module pin function out of reset. Refer to APPENDIX D REGISTER SUM-
MARY for register function and reset state.
The MC68HC916Y3 flash modules do not yet support the emulator
mode. If ROM emulation is enabled, the CSM chip-select will be
driven high at all times.
Module
CTM7
ADC
CPU
1
Freescale Semiconductor, Inc.
For More Information On This Product,
Table 5-20 Module Pin Functions
PADA[7:0]/AN[7:0]
Go to: www.freescale.com
Pin Mnemonic
BKPT/DSCLK
CPWM[19:18]
DSO/IPIPE0
CTS16[A:B]
CTS14[A:B]
CTS12[A:B]
CTS10[A:B]
DSI/IPIPE1
CTS8[A:B]
CTS6[A:B]
CTD[5:4]
CTM2C
V
V
RH
RL
NOTE
Reference voltage
Reference voltage
Discrete output
BKPT/DSCLK
Discrete input
Discrete input
Discrete input
Discrete input
Discrete input
Discrete input
Discrete input
Discrete input
Discrete input
DSO/IPIPE0
DSI/IPIPE1
Function
MC68HC16Y3/916Y3
USER’S MANUAL