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PDF EM73880 Data sheet ( Hoja de datos )
| Número de pieza | EM73880 | |
| Descripción | 4-BIT MICRO-CONTROLLER FOR LCD PRODUCT | |
| Fabricantes | ELAN Microelectronics Corp | |
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EM73880
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
GENERAL DESCRIPTION
EM73880 is an advanced single chip CMOS 4-bit micro-controller. It contains 8K-byte ROM, 244-nibble RAM,
4-bit ALU, 13-level subroutine nesting, 22-stage time base, two 12-bit timer/counters for the kernel function.
EM73880 also contains 6 interrupt sources, 1 input port, 2 bidirection ports, LCD display (32x4), and one high
speed timer/counter,sound generator, and speech synthesizer.
EM73880 has plentiful operating modes (SLOW, IDLE, STOP) intended to reduce the power consumption.
FEATURES
• Operation voltage : 2.4V to 3.6V.
• Clock source
: Dual clock system. Low-frequency oscillator (32.768 KHz) could be Crystal or RC
oscillator high-frequency oscillator is a built-in for 4.6 MHz.
• Instruction set
: 107 powerful instructions.
• Instruction cycle time : 1.7us for 4.6 MHz (high speed clock).
244 µs for 32768 Hz (low speed clock).
• ROM capacity
: 8192 X 8 bits.
• RAM capacity
: 244 X 4 bits.
• Input port
: 1 port (P0). P0(0..3) and IDLE releasing function are available by mask option.
• Bidirection port
: 2 ports (P4, P8). P4.1 is shared with HTC external input. P8(0..3) and IDLE releasing
function are available by mask option.
• 12-bit timer/counter : Two 12-bit timer/counters are programmable for timer, event counter and pulse width
measurement.
• High speed timer/counter : One 8-bit high speed timer/counters is programmable for auto load timer, melody
output and pulse width measurement.
• Speech synthesizer : 160K Speech ROM.
• Built-in time base counter : 22 stages.
• Subroutine nesting : Up to 13 levels.
• Interrupt
: External . . . . . 1 input interrupt sources.
Internal . . . . . . 2 Timer overflow interrupts, 1 time base interrupt.
1 high speed timer/counter overflow interrupt.
1 Speech ending interrupt.
• LCD driver
: 32 X 4 dots, 1/4,1/3,1/2, static 4 kinds of duty Type selectable, 1/2 bias, 1/3 bias, 2 kinds
bias Type selectable.
• Power saving function : SLOW, IDLE, STOP operation mode.
• Package type
: Chip form. . . . .63 pins.
APPLICATIONS
EM73880 is suitable for application in family applicance, consumer products, hand held games and the toy
controller.
* This specification are subject to be changed without notice.
11.30.2001 1
1 page  
EM73880
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
LCD display RAM:
Increment
Address
00h~0Fh
10h~1Fh
20h~2Fh
30h~3Fh
40h~4Fh
:
B0h ~ BFh
C0h ~ CFh level 0
D0h ~ DFh level 4
E0h ~ EFh level 8
F0h ~ F3h level C
zero page
LCD display RAM
level 1
level 5
level 9
level 2
level 6
level A
level 3
level 7
level B
RAM address from 20h ~ 3Fh are the LCD display RAM area, the RAM data of this region can't be operated
by instruction LDHL xx and EXHL.
ZERO- PAGE:
From 00h to 0Fh is the location of zero-page . It is used as the pointer in zero -page addressing mode for the
instruction of "STD #k,y; ADD #k,y; CLR y,b; CMP k,y".
PROGRAM EXAMPLE: To wirte immediate data "07h" to address "03h" of RAM and to clear bit 2 of RAM.
STD #07h, 03h ; RAM[03] ← 07h
CLR 0Eh,2 ; RAM[0Eh]2 ← 0
STACK:
There are 13 - level (maximum) stack for user using for subroutine (including interrupt and CALL). User
can assign any level be the starting stack by giving the level number to stack pointer (SP).
When user using any instruction of CALL or subroutine, before entry the subroutine, the previous PC address
will be saved into stack until return from those subroutines ,the PC value will be restored by the data saved
in stack.
DATA AREA:
Except the special area used by user, the whole RAM can be used as data area for storing and loading general
data.
ADDRESSING MODE
(1) Indirect addressing mode:
Indirect addressing mode indicates the RAM address by specified HL register.
For example: LDAM ; Acc ← RAM[HL]
STAM ; RAM[HL] ← Acc
(2) Direct addressing mode:
Direct addressing mode indicates the RAM address by immediate data.
* This specification are subject to be changed without notice.
11.30.2001 5
5 Page 
(3) Rotation:
EM73880
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
There are two kinds of rotation operation, one is rotation left, the other is rotation right.
RLCA instruction rotates Acc value to left, shift the CF value into the LSB bit of Acc and the shift out data
will be hold in CF.
MSB LSB
ACC
CF
RRCA instruction operation rotates Acc value to right, shift the CF value into the MSB bit of Acc and the
shift out data will be hold in CF.
MSB LSB
ACC
CF
PROGRAM EXAMPLE: To rotate Acc right and shift a "1" into the MSB bit of Acc .
TTCFS; CF ← 1
RRCA; rotate Acc right and shift CF=1 into MSB.
HL REGISTER
HL register are two 4-bit registers, they are used as a pair of pointer for the address of RAM memory and also
2 independent temporary 4-bit data registers. For some instruction, L register can be a pointer to indicate the
pin number ( Port4 ) .
HL REGISTER STRUCTURE
3210 3210
H REGISTER L REGISTER
* This specification are subject to be changed without notice.
11.30.2001 11
11 Page | ||
| Páginas | Total 40 Páginas | |
| PDF Descargar | [ Datasheet EM73880.PDF ] | |
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