MCMC68HC05L16 Freescale Semiconductor, Inc, MCMC68HC05L16 Datasheet - Page 21

• Manufacturer Part Number: MCMC68HC05L16
• Description: M68hc05 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

1.6.2 Single-Chip Mode (SCM)
In this mode, all address and data bus activity occurs within the MCU. Thus, no external pins are required
for these functions. The single-chip mode allows the maximum number of I/O pins for on-chip peripheral
functions, for example, ports A through E, and LCD drivers.
1.6.3 Self-Check Mode
In this mode, the reset vector is fetched from a 496-byte internal self-check ROM at $FE00–$FFEF. The
self-check ROM contains a self-check program to test the functions of internal modules.
Since this mode is not a normal user mode, all of the privileged control bits are accessible. This allows
the self-check mode to be used for self- test of the device.
Freescale Semiconductor
RESET
V
IRQ2
IRQ1
TST
= 2 x V
DD
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Figure 1-5. Mode Entry Diagram
SINGLE-CHIP MODE
Modes of Operation
V
V
V
V
V
V
V
TST
DD
DD
DD
SS
SS
SS
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