MC68704P2 Microcomputer Datasheet

MC68704P2 Datasheet PDF, Equivalent


Part Number

MC68704P2

Description

HMOS Microcomputer

Manufacture

Motorola

Total Page 20 Pages
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Download MC68704P2 Datasheet PDF


MC68704P2
MOTOROLA·
I SEMICONDUCTOR
TECHNICAL DATA
MC68704P2
TechnicalSummary
HMOS Microcomputer Unit
MC68704P2 HMOS (high-density NMOS) microcomputer unit (MCU) is an EPROM member of the
M6804 Family of microcomputers. User programmable EPROM allows program changes and lower
volume applications. This feature further heightens the versatility of an MCU whose design-ability
to process 8-bit variables, one bit at a time, already makes it tremendously cost effective.
This technical summary contains limited information on the MC68704P2. For detailed information,
refer to the advanced information data sheet for·the MC6804J1, MC6804J2, MC6804P2, and
MC68704P2 8-bit microcomputers, (MC6804J1/D) or to the M6804 MeV Manual (DLE404/D).
Major hardware and software features of the MC68704P2 MCU are:
• On-Chip Clock Generator
• 1/0 and Registers Mapped in Data
Space Memory
• Software Programmable8-Bit Timer
with 7-Bit Prescaler
• Single Instruction Memory Examinel
Change
• MC6804JlIJ2/P2 Emulation
• 1088 Bytes of EPROM
• True Bit Manipulation
• Bit Test and Branch Instruction
•. Breakpoint and Mask Option Registers
• Self-Check
• Conditional Branches
• Timer Pin is Software Programmable
as Event Counter or Timer Output
• MC68HC04P2/P3 Pin Compatibility
• 32 Bytes of RAM
User selectable options, are:
• Mask Selectable Edge- or Level-Sensitive Interrupt Pin
• .Push-Pull or Open-Drain Interface Ports
BLOCK DIAGRAM
II
TIMER
PAD
PAl
PORT PA2
PA3
I/O PA4
LINES PA5
PA6
PA7
PORT
A
REG.
DATA
DlR.
REG.
x1016 8
USER PROGRAM EPROM
320 x 8
SELF-CHECK ROM
ACCUMULATOR
A
INDIRECT
REGISTER
INDIRECT
REGISTER
STACK
PROGRAM
COUNTER
HIGH PCH
PROGRAM
COUNTER
lOW PCl
CPU
CPU
CONTROL
BREAKPOINT
REGISTERS
EPROM
MASK OPT. REG.
AlU
PBO
PBl
PB2 PORT
PB3 B
PB4 I/O
PB5 LINES
PB6
PB7
PCO PORT
PCl C
PC2 I/O
PC3 LINES
This document contains information on a new product. Specifications and information herein are subject to change without notice.
MOTOROLA MICROPROCESSOR DATA
3-335

MC68704P2
MC68704P2
SIGNAL DESCRIPTION
Vec AND VSS
Power is supplied to the microcomputer using these
two pins. Vee is + 5 volts 0.5 V) power, and VSS is
ground.
IRQ
This pin provides the capability for asynchronously ap-
plying an external interrupt to the microcomputer.
II
EXTAL AND XTAL
These pins provide control input for the on-chip clock
oscillator circuit. A crystal, a resistor/capacitor combi-
nation, or an external signal is connected to these pins
to provide a system clock. Selection is made through the
mask option register (MOR). The different clock generator
options are shown in Figure 1, along with crystal speci-
fications.
Internal Clock Options
The crystal oscillator start-up time is a function of many
variables. To ensure rapid oscillator start-up, neither the
crystal characteristics nor load capacitances should ex-
ceed recommendations. When using the on-boardoscil-
lator, the MeUshould remain in a reset condition, with
the RESET pin voltage below VIRES+, until the osCillator
has stabilized at its operating frequency. See Figure 2 for
resistor/capacitor oscillator options.
TIMER
The TIMER pin can be configured to operate in either
the input or output mode. As input, this pin is connected
to the prescaler input and sehies as the timer clock. As
output, the timer pin reflects the contents of the DOUT
bit of the timer status/control register, the last time the
TMZ bit was logic high.
RESET
, The RESET pin is used to restart the processor to the
beginning ofa program. The program counter is loaded
with the address of the restart vector. This should be a
jump instruction to the first instruction of the main pro-
gram. Together with the MDS pin, the RESET pin selects
the operating mode of the MeU.
MDSlVpp
The mode select (MDS) pin places the MeU into special
operating modes. When this pin is logic high at the exit
of the reset state, the decoded state of PA6and PA7 is
latched to determine the operating mode. This choice can
be either the single-chip, self-check, or EPROM program-
ming. However, if MDS is logic low at the end of the reset
state, the single-chip operating mode is automatically
selected. No external diodes, switches, transistors, etc.
are required for single-chip mode selection. This pin is
raised to Vpp voltage to program the EPROM.
INPUT/OUTPUT LINES (PAO-PA7, PBO-PB7, PCO·PC3)
These 20 lines are arranged into two 8-bit ports (A and
B) and one 4-bit port (e). All lines are programmable as
NC
EXTERNAL
CLOCK
INPUT
EXTAL
MCU
XTAL (CRYSTAL MASK
OPTIONI
+5V
4.7 k
EXTAL
XTAL
MCU
(RESISTOR·CAPACITOR MASK
OPTIONI
(al
CRYSTAL PARAMETERS
G2J-."",EX""
C1
CRYSTAL PARAMETERS
AT - CUT PARALLEL RESONANCE CRYSTAL
Co =7 pF MAXIMUM
FREO. = 11 MHz
RS = 50 OHMS MAXIMUM
PIEZOELECTRIC CERAMIC RESONATORS MAY BE
SUBSTITUTED FOR THE CRYSTAl. FOLLOW
MANUFACTURER'S " CERAMIC RESONATOR
SPECIFICATIONS.
EXTERNAL CLOCK
(* DENOTES NC/GNO. GROUNDING
PIN 4 WILL REDUCE RFI NOISE.)
EXTERNAL RESISTOR·CAPACITOR
XTAL
CJ MCU
EXTAL (CRYSTAL MASK
OPTIONI
NOTE: Keep crystal leads and circuit connections as short as possible.
Figure 1. Clock Generator Options and Crystal Parame~ers
MOTOROLA MICROPROCESSOR DATA
3-336


Features MOTOROLA· I SEMICONDUCTOR TECHNICAL DAT A MC68704P2 TechnicalSummary HMOS Mic rocomputer Unit MC68704P2 HMOS (high-d ensity NMOS) microcomputer unit (MCU) i s an EPROM member of the M6804 Family o f microcomputers. User programmable EPR OM allows program changes and lower vol ume applications. This feature further heightens the versatility of an MCU who se design-ability to process 8-bit vari ables, one bit at a time, already makes it tremendously cost effective. This t echnical summary contains limited infor mation on the MC68704P2. For detailed i nformation, refer to the advanced infor mation data sheet for·the MC6804J1, MC 6804J2, MC6804P2, and MC68704P2 8-bit m icrocomputers, (MC6804J1/D) or to the M 6804 MeV Manual (DLE404/D). Major hardw are and software features of the MC6870 4P2 MCU are: • On-Chip Clock Generat or • 1/0 and Registers Mapped in Data Space Memory • Software Programmable 8-Bit Timer with 7-Bit Prescaler • Si ngle Instruction Memory Examinel Change • MC6804JlIJ2/P2 Emulation • 1088.
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