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PDF EM73A88A Data sheet ( Hoja de datos )
| Número de pieza | EM73A88A | |
| Descripción | 4-BIT MICRO-CONTROLLER FOR LCD PRODUCT | |
| Fabricantes | ELAN Microelectronics Corp | |
| Logotipo |  |
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GENERAL DESCRIPTION
EM73A88A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
EM73A88A is an advanced single chip CMOS 4-bit micro-controller. It contains 16K-byte ROM, 500-nibble
RAM, 4-bit ALU, 13-level subroutine nesting, 22-stage time base, two 12-bit timer/counters for the kernel
function. EM73A88A also equipped with 6 interrupt sources, 3 I/O ports (including 1 input port and 2 bidirection
ports), LCD display (64x16), built-in sound generator and speech synthesizer can direct drive speaker.
It's low power consumption and high speed feature are further strengten with DUAL, SLOW, IDLE and STOP
operation mode for optimized power saving.
FEATURES
• Operation voltage
: 2.2V to 4.8V.
• Clock source
: Dual clock system. Low-frequency oscillator is 32 KHz Crystal or RC oscillator
and high-frequency oscillator is a built-in internal oscillator (4.6 MHz).
• Instruction set
: 107 powerful instructions.
• Instruction cycle time : 1.7µs for 4.6M Hz (high speed clock).
244µs for 32768 Hz (low speed clock).
• ROM capacity
: 16K x 8 bits.
• RAM capacity
: 500 x 4 bits.
• Input port
: 1 port (P0.0-P0.3), IDLE/STOP releasing function is available by mask option.
(each input pin has a pull-up and pull-down resistor available by mask option).
• Bidrection port
: 2 ports (P4, P8). IDLE/STOP release function for P8(0..3) is available by mask
option.
• Built-in watch-dog-timer counter : It is available by mask option.
• 12-bit timer/counter : Two 12-bit timer/counters are programmable for timer, event counter and pulse
width measurement mode.
• Built-in time base counter : 22 stages.
• Subroutine nesting
: Up to 13 levels.
• Interrupt
: External interrupt . . . . . . 2 input interrupt sources.
Internal interrupt . . . . . . 2 timer overflow interrupts, 1 time base interrupt.
1 speech interrupt.
• LCD driver
: 64x16 dots, 1/16 duty, 1/5 bias with voltage multiplier.
• Sound effect
: Tone generator and random generator.
• Speech synthesizer
: 448K speech data ROM (use as 448K nibbles data ROM).
• PWM or current D/A : Output selection by mask option.
• Power saving function : SLOW, IDLE, STOP operation modes.
• Package type
: Chip form 109 pins.
* This specification are subject to be changed without notice.
10.8.2001 1
1 page  
EM73A88A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
B XA2
:
;--------------- -------------------- -------------------- -------------------- --
BANK 2
XB1 :
:
:
B XB
:
XB2 :
:
B XB2
:
;--------------- -------------------- -------------------- -------------------- --
BANK 3
XC1 :
:
:
B XC
:
XC2 :
:
B XC2
Fixed data can be read out by table-look-up instruction. Table-look-up instruction is requires the Data point
(DP) to indicate the ROM address in obtaining the ROM code data (Except bank 0) :
LDAX
LDAXI
Acc ← ROM[DP]L
Acc ← ROM[DP]H,DP+1
DP is a 12-bit data register that stores the program ROM address as pointer for the ROM code data.
User has to initially load ROM address into DP with instructions "STADPL", and "STADPM, STADPH",
then to obtain the lower nibble of ROM code data by instruction "LDAX" and higher nibble by instruction
"LDAXI"
PROGRAM EXAMPLE: Read out the ROM code of address 1777h by table-look-up instruction.
LDIA #07h;
STADPL
STADPM
STADPH
:
; [DP]L ← 07h
; [DP]M ← 07h
;
[DP]
H
←
07h,
Load
DP=777h
LDL #00h;
LDH #03h;
LDAX
; ACC ← 6h
STAMI ; RAM[30] ← 6h
LDAXI ; ACC ← 5h
STAM
; RAM[31] ← 5h
;
ORG 1777h
DATA 56h;
DATA RAM ( 500-nibble )
A total 500 - nibble data RAM is available from address 000 to 1FFh
Data RAM includes the zero page region, stacks and data areas.
* This specification are subject to be changed without notice.
10.8.2001 5
5 Page 
EM73A88A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
PROGRAM EXAMPLE:
Preliminary
Check following arithematic operation for CF, ZF, SF
LDIA #00h;
LDIA #03h;
ADDA #05h;
ADDA #0Dh;
ADDA #0Eh;
CF ZF
-1
-0
-0
-0
-0
SF
1
1
1
0
0
ALU
The arithematic operation of 4 - bit data is performed in ALU unit . There are 2 flags that can be affected by
the result of ALU operation, ZF and SF. The operation of ALU is affected by CF only.
ALU STRUCTURE
ALU supported user arithematic operation functions, including Addition, Subtraction and Rotaion.
DATA BUS
ALU
ALU FUNCTION
ZF CF SF
(1) Addition:
ALU supports addition function with instructions ADDAM, ADCAM, ADDM #k, ADD #k,y .... .
The addition operation affects CF and ZF. Under addition operation, if the result is "0", ZF will be "1",
otherwise, ZF will be "0", When the addition operation has a carry-out. CF will be "1", otherwise, CF will
be "0".
EXAMPLE:
Operation
3+4=7
7+F=6
0+0=0
8+8=0
Carry
0
1
0
1
Zero
0
0
1
1
(2) Subtraction:
ALU supports subtraction function with instructions SUBM #k, SUBA #k, SBCAM, DECM... . The
subtraction operation affects CF and ZF. Under subtraction operation, if the result is negative, CF will
be "0", and a borrow out, otherwise, if the result is positive, CF will be "1". For ZF, if the result of subtraction
operation is "0", the ZF is "1", likewise, ZF is "1".
* This specification are subject to be changed without notice.
10.8.2001 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EM73A88A.PDF ] | |
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