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EM78P267 Schematic ( PDF Datasheet ) - EMC

Teilenummer EM78P267
Beschreibung 8-BIT MICRO-CONTROLLER
Hersteller EMC
Logo EMC Logo 




Gesamt 20 Seiten
EM78P267 Datasheet, Funktion
DESCRIPTION
EM78P267/467A/B/C
8-BIT MICRO-CONTROLLER FOR CONSUMER PRODUCT
Preliminary
The EM78P267/467A/B/C is an 8-bit microprocessor with low-power, high speed CMOS technology. There
are 4Kx13 bits Electical One Time Programmable Read Only Memory (OTP-ROM) within it. It provides 1
Protect bit and 6 One-time Programmable Option bits to protect the OTP memory code from any external access
as well as the user's options.
The OTP ROM will be incorporated into EM78P267/467A/B/C 8-bit microcontroller instead of it's original
memory. The user's development program can be easily programmed into or verify from this OTP memory by
using EMC OTP PROGRAMMER.
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 EM78P267/467A) (24 I/O pins for EM78P267/467B)
(22 I/O pins for EM78P267/467C)
• 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
(EM78P267/467A)
28 pin SOIC
(EM78P267/467C)
* This specification are subject to be changed without notice.
9.5.1997 1






EM78P267 Datasheet, Funktion
EM78P267/467A/B/C
8-BIT MICRO-CONTROLLER FOR CONSUMER PRODUCT
Preliminary
00 R0
01 R1(TCC)
02 R2(PC)
03 R3(Status)
04 R4(RSR)
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
Stack
(5 levels)
IOC5
IOC6
IOC7
IOCB
IOCE
IOCF
10
11
16x8
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.
9.5.1997
6

6 Page









EM78P267 pdf, datenblatt
VCC
Weekly
Pull-up
EM78P267/467A/B/C
8-BIT MICRO-CONTROLLER FOR CONSUMER PRODUCT
Preliminary
PCRD
ROC
Q PR D
CLK
Q CL
PCWR
PORT
Q PR D
CLK
Q CL
PDWR
PDRD
Rex*
0M
1U
X
* 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
9.5.1997 12

12 Page





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