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PDF EM78860 Data sheet ( Hoja de datos )
| Número de pieza | EM78860 | |
| Descripción | 8-BIT MICRO-CONTROLLER | |
| Fabricantes | ELAN Microelectronics Corp | |
| Logotipo |  |
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EM78860
8-BIT MICRO-CONTROLLER
GENERAL DESCRIPTION
The EM78860 is an 8-bit RISC type microprocessor with low power , high speed CMOS technology .
Integrated onto a single chip are on_chip watchdog (WDT) , RAM , ROM , programmable real time clock /
counter , internal interrupt , power down mode , LCD driver and tri-state I/O . The EM78860 provides a single
chip solution to design a message display .
FEATURES
CPU
• Operating voltage range : 2.5V~5.5V
• 16Kx13 on chip ROM
• 2.8Kx8 on chip RAM
• Up to 32 bi-directional tri-state I/O ports
• 8 Level stack for subroutine nesting
• 8-bit real time clock/counter (TCC)
• Two sets of 8 bit counters can be interrupt sources
• Selective signal sources and with overflow interrupt
• Programmable free running on chip watchdog timer
• 99.9% single instruction cycle commands
• Four modes (internal clock 3.679MHz, external 32.768KHz)
1. Sleep mode : CPU and 3.679MHz clock turn off, 32.768KHz clock turn off
2. Idle mode : CPU and 3.679MHz clock turn off, 32.768KHz clock turn on
3. Green mode : 3.679MHz clock turn off, CPU and 32.768KHz clock turn on
4. Normal mode : 3.679MHz clock turn on , CPU and 32.768KHz clock turn on
• Low battery detector
• Input port wake up function
• 8 interrupt source , 4 external , 3 internal
• 100 pin QFP or chip
• Port key scan function
• Port interrupt , pull high and open drain functions
• Clock frequency 32.768KHz externally
LCD
• LCD operation voltage chosen by software
• Common driver pins : 16
• Segment driver pins : 60
• 1/4 bias
• 1/8,1/16 duty
APPLICATION
1. adjunct units
2. data bank
* This specification are subject to be changed without notice.
6.24.1998 1
1 page  
EM78860
8-BIT MICRO-CONTROLLER
ADDRESS REGISTER
00 R0
01 R1(TCC)
02 R2(PC)
03 R3(STATUS)
04 R4(RSR)
05 R5(ROM PAGE)
06 R6(PORT6)
07 R7(PORT7)
08 R8(PORT8)
09 R9(PORT9)
0A RA(CLK)
0B RB()
0C RC(2.5K RAM ADRESS)
0D RD(2.5K RAM DATA)
0E RE
0F RF(INT FLAG)
10 16x8
: Common
1F Register
20 BANK0~BANK3
: 32X8 ~ 32X8
3F REGISTER
CONTROL REGISTER
(PAGE0)
CONTROL REGISTER
(PAGE1)
page0
IOC6
IOC7
IOC8
IOC9
IOCA
IOCB(LCD ADDRESS)
IOCC(LCD DATA)
IOCD(PULL HIGH)
IOCE(IO, LCD)
IOCF(INT CONTROL)
RC(ADDRESS) RD(DATA)
page1
IOCB(COUNTER1)
IOCC(COUNTER2)
0 BAND1 BAND1 . . . . . . . . . . . . BAND10
: 256X8 256X8 . . . . . . . . . . . . 256X8
255
Fig.5 Data memory configuration
R3 ( Status Register )
7 65 4 3 2 1 0
-
PAGE
-
T
P
Z DC C
• Bit 0 (C) : Carry flag
• Bit 1 (DC) : Auxiliary carry flag
• Bit 2 (Z) : Zero flag
• Bit 3 (P) : Power down bit. Set to 1 during power on or by a “WDTC” command and reset to 0 by a
“SLEP” command.
• Bit 4 (T) : Time-out bit. Set to 1 by the “SLEP” and “WDTC” command, or during power up and reset
to 0 by WDT time out.
EVENT
WDT TIME OUT
sleep mode
WDT time out (not sleep mode
/RESET wake up from sleep
power up
Low pulse on /RESET
T P REMARK
00
01
10
11
x x x . . don't care
• Bit 5 : unused
• Bit 6 PAGE : changed IOCB~IOCE to another page, 0/1→page0/page1
• Bit 7 unused
* This specification are subject to be changed without notice.
6.24.1998 5
5 Page 
EM78860
8-BIT MICRO-CONTROLLER
7654
32
P9SH
P9SL
P6S
Bias3
Bias2 Bias1
1
0
0
SC
• Bit 0 :SC (SCAN KEY signal ) 0/1 = disable/enable. Once you enable this bit , all of the LCD signal will have
a low pulse during a common period. This pulse has 30us width. Please use the procedure to implement the
key scan function.
a. set port7 as input port
b. set IOCD page0 port7 pull high
c. enable scan key signal
d. Once push a key . Set RA(6)=1 and switch to normal mode.
e. Blank LCD. Disable scan key signal.
f. Set P6S =0. Port6 sent probe signal to port7 and read port7. Get the key.
g. Note!! A probe signal should be delay a instruction at least to another probe signal.
h. Set P6S =1. Port6 as LCD signal. Enable LCD.
KEY5
KEY1
P63
KEY2
P62
KEY3
P61
KEY4
P60
P73 P72
P71
P70
Fig.8. Key scan circuit
com2
VDD
V1
V2
V3
V4
VLCD
GND
VDD
V1
V2
V3
seg V4
VLCD
GND
30µs
Fig.9. Key scan signal
* This specification are subject to be changed without notice.
6.24.1998 11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet EM78860.PDF ] | |
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