Datenblatt-pdf.com


EM78267A Schematic ( PDF Datasheet ) - EMC

Teilenummer EM78267A
Beschreibung 8-BIT MICRO-CONTROLLER
Hersteller EMC
Logo EMC Logo 




Gesamt 19 Seiten
EM78267A Datasheet, Funktion
DESCRIPTION
EM78267/467A/B/C
8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
Preliminary
The EM78267/467 A/B/C is an 8-bit microprocessor with low-power, high speed CMOS technology. Integrated
onto a single chip are on-chip watchdog timer (WDT), RAM, ROM, programmable real time clock/counter,
power down mode and bi-directional tri-state I/O ports. It can be developed as cordless phone or other applications.
FEATURES
• Operating voltage range: 2.5V~5.5V
• Available in temperature range: 0°C~70°C
• Operating frequency range:
Crystal Type: DC~20MHz at 5V
DC~8MHz at 3V
RC Type:
DC~4MHz at 5V
DC~4MHz at 3V
• 2Kx13 on chip ROM (EM78267A/B/C)
• 4Kx13 on chip ROM (EM78467A/B/C)
• 9 special function registers
• 148x8 general purpose registers (SRAM)
• 3 bi-directional tri-state I/O ports (20 I/O pins for EM78267/467A) (24 I/O pins for EM78267/467B)
(22 I/O pins for EM78267/467C)
• 5 level stack for subroutine nesting
• 8-bit real time clock/counter (TCC) with selective signal sources and trigger edges, and with overflow interrupt
• Selectable oscillator options:
XTAL1 type (High frequency)
XTAL2 type (32.768KHz)
RC type
External clock input
• Two oscillator periods per instruction cycle
• Power down mode
• Programmable wake up from sleep circuit on I/O ports
• Programmable free running on-chip watchdog timer
• Ten pull-up and wake-up pins
• Two open-drain pins
• Two R-option pins
• Interrupt function available
• 28 pin DIP, SOIC, SSOP
(EM78267/467A)
28 pin SOIC
(EM78267/467C)
32 pin DIP, SOIC
(EM78267/467B)
* This specification are subject to be changed without notice.
9.30.1997 1






EM78267A Datasheet, Funktion
EM78267/467A/B/C
8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
Preliminary
00 R0
01 R1(TCC)
02 R2(PC)
03 R3(Status)
04 R4(RSR)
Stack
(5 levels)
05 R5(Port5)
06 R6(Port6)
07 R7(Port7)
08 R8
09 R9
0A RA
0B RB
0C RC
0D RD
0E RE
0F RF
IOC5
IOC6
IOC7
IOCB
IOCE
IOCF
10 16x8
11 Common
: Register
:
1F
00 01 10 11
10
31x8
31x8
31x8
31x8
:
Bank
Bank
Bank
Bank
Register
Register
Register
Register
:
(Bank 0) (Bank 1) (Bank 2) (Bank 3)
3E
3F R3F
Fig. 4 Data memory configuration
R8~R1F, R20~R3E (General Purpose Register)
R8~R1F, and R20~R3E (including Banks 0~3) are general purpose registers.
R3F (Interrupt Status Register)
7 6 5 4 3 210
- - - - EXIF - - TCIF
Bit 0 (TCIF) TCC timer overflow interrupt flag. Set when TCC timer overflows, reset in software.
Bit 3 (EXIF) External interrupt flag. Set by falling edge on /INT pin, reset in software.
Bits 1~2, 4~7 Not used.
1means interrupt request, 0means non-interrupt
R3F can be cleared by instruction and cannot be set by instruction.
* This specification are subject to be changed without notice.
9.30.1997
6

6 Page









EM78267A pdf, datenblatt
VCC
Weekly
Pull-up
EM78267/467A/B/C
8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
Preliminary PCRD
ROC
Q PR D
CLK
Q CL
PCWR
PORT
Rex*
0M
1U
X
Q PR D
CLK
Q CL
PDWR
PDRD
* The Rex is 560K ohm external resistor
Fig. 7(b) The circuit of I/O port with R-option (P70,P71)
IOD
Oscillator
Power-on
Reset
VDD
DQ
CLK
CLR
WTE
WDT WDT Timeout
18 ms
RESET
Fig. 8 Block diagram of Reset of controller
RESET and Wake-up
The RESET can be caused by
(1) Power on reset,
(2) /RESET pin input “low”, or
* This specification are subject to be changed without notice.
CLK
Reset
9.30.1997 12

12 Page





SeitenGesamt 19 Seiten
PDF Download[ EM78267A Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
EM782678-BIT MICRO-CONTROLLEREMC
EMC
EM78267A8-BIT MICRO-CONTROLLEREMC
EMC
EM78267B8-BIT MICRO-CONTROLLEREMC
EMC
EM78267C8-BIT MICRO-CONTROLLEREMC
EMC

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche