MC68HC05B4 Datasheet, PDF (29/298 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

2
2
MODES OF OPERATION AND PIN
DESCRIPTIONS
2.1
Modes of operation
The MC68HC05B6 MCU has two modes of operation, namely single chip and self check modes.
Table 2-1 shows the conditions required to enter each mode on the rising edge of RESET.
Table 2-1 Mode of operation selection
IRQ pin TCAP1 pin PD3
V_SS to V_DD V_SS to V_DD
X
2V_DD
V_DD
1
2V_DD
V_DD
1
PD4
Mode
X
Single chip
0
Serial RAM loader
1
Jump to any address
2.1.1 Single chip mode
This is the normal operating mode of the MC68HC05B6. In this mode the device functions as a
self-contained microcomputer (MCU) with all on-board peripherals, including the three 8-bit I/O
ports and the 8-bit input-only port, available to the user. All address and data activity occurs within
the MCU.
MC68HC05B6
Rev. 4
MODES OF OPERATION AND PIN DESCRIPTIONS
TPG
MOTOROLA
2-1