MC68HC901 Datasheet, PDF (14/73 Pages) Motorola, Inc – Multi-Function Peripheral

SECTION 2
SIGNAL DESCRIPTION
This section contains descriptions of the input and output signals. The input and output
signals can be functionally organized into groups as shown in Figure 2-1. The following
paragraphs provide a brief description of the signal and a reference (if applicable) to other
sections that contain more detail about its function.
NOTE
Assertion and negation are used to specify forcing a signal to a
particular state. Assertion and assert refer to a signal that is
active or true. Negation and negate refer to a signal that is
inactive or false. These terms are used independently of the
voltage level (high or low) that they represent.
POWER
SUPPLY
VCC
GND
CLK
D0 – D7 DATA BUS
ASYNCHRONOUS
BUS CONTROL
CS
DS
R/W
DTACK
RS1 – RS5 REG SEL
INTERRUPT
CONTROL
RESET
IRQ
IACK
IEI
IEO
MC68HC901
MULTI-FUNCTION
PERIPHERAL
(MFP)
GPIP
I0 – I7
TAI
TBI
TAO
TBO
TCO
TDO
XTAL1
XTAL2
TIMER
CONTROL
SI
SO
SERIAL I / O
RC
CONTROL
TC
RR
DMA
TR
CONTROL
Figure 2-1. Input and Output Signals
2.1 POWER SUPPLY (V_CC and GND) _{FIGURE - INPUT AND OUTPUT SIGNALS}
Power is supplied to the MFP using these^Mc^C6o^8Hn^Cn⁹⁰e¹c^UMtio^{/ A}n^Ds. The V_CC pin is powered at +5 volts,
and ground is connected to the GND pins.
MOTOROLA
MC68HC901 USER’S MANUAL
2-1