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PDF EM73461B Data sheet ( Hoja de datos )
| Número de pieza | EM73461B | |
| Descripción | 4-BIT MICRO-CONTROLLER FOR LCD PRODUCT | |
| Fabricantes | ELAN Microelectronics Corp | |
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EM73461B
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
GENERAL DESCRIPTION
EM73461B is an advanced single chip CMOS 4-bit micro-controller. It contains 4K/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. EM73461B also contains 6 interrupt sources, 1 input port, 2 bidirection ports, LCD display (32x4), and
one high speed timer/counter with melody output.
EM73461B 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 is Crystal or RC oscillator (32K Hz,
connect an external resistor) by mask option and high-frequency oscillator is RC
oscillator (connect an external resistor), or built-in internal oscillator.
• Instruction set
: 109 powerful instructions for 4K ROM / 107 powerful instructoins for 8K ROM.
• Instruction cycle time : 0.85µs for 9.2M or 1.7µs for 4.6M or 2µs for 4MHz. Selected by mask option (high
speed clock).
122 µs or 244µs by frequency double mask option for 32768 Hz (low speed clock).
• ROM capacity
: 4096 X 8 bits / 8192 X 8 bits ROM are choosed by mask option.
• 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). P4.0 and SOUND is available by mask option. 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.
• Built-in time base counter : 22 stages.
• Subroutine nesting : Up to 13 levels.
• Interrupt
: External . . . . . 2 input interrupt sources.
Internal . . . . . . 2 Timer overflow interrupts, 1 time base interrupt.
1 high speed timer overflow interrupt.
• LCD driver
: 32 X 4 dots, 1/4duty, 1/3duty, 1/2duty, static, 1/2 bias, 1/3 bias; 6 options selectable.
• Power saving function : SLOW, IDLE, STOP operation mode.
• Package type
: Chip form 61 pins.
APPLICATIONS
EM73461B 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.
12.26.2001 1
1 page  
PROGRAM ROM (8K X 8 bits)
EM73461B
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
8 K x 8 bits program ROM contains user's program and some fixed data .
The basic structure of program ROM can be divided into 6 parts.
1. Address 0000h: Reset start address.
2. Address 0002h - 000Ch : 6 kinds of interrupt service routine entry addresses .
3. Address 000Eh - 0086h : SCALL subroutine entry address, only available at 000Eh, 0016h, 001Eh, 0026h, 002Eh,
0036h, 003Eh, 0046h, 004Eh, 0056h, 005Eh, 0066h, 006Eh, 0076h, 007Eh, 0086h.
4. Address 0000h - 07FFh : LCALL subroutine entry address.
5. Address 0000h - 1FFFh : Except used as above function, the other region can be used as user's program region.
6. Address 1000h - 1FFFh : Fixed data stortage area.
address
000h
002h
004h
006h
008h
00Ah
00Ch
00Eh
086h
800h
:
FFFh
1FFFh
8192 x 8 bits
Reset start address
INT0; External interrupt service routine entry address
HTCI; High speed timer interrupt service entry address
TRGA; Timer/counterA interrupt service routine entry address
TRGB; Timer/counter B interrupt service routine entry address
TBI; Time base interrupt service routine entry address
INT1; External interrupt service routine entry address
SCALL, subroutine call entry address
1000h
:
Bank 1
LCALL entry address
fixed data area
User's program and fixed data are stored in the program ROM. User's program is according the PC value
to send next executed instruction code. Fixed data can be read out by table-look-up instruction.
Please note that fixed data only can be stored in 8K ROM Bank 1.
The program counter is a 13-bit binary counter. The PC can defined 8K ROM.
* This specification are subject to be changed without notice.
12.26.2001 5
5 Page 
EM73461B
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
(1) Carry Flag ( CF )
The carry flag is affected by following operation:
a. Addition : CF as a carry out indicator, when the addition operation has a carry-out, CF will be "1",
in another word, if the operation has no carry-out, CF will be "0".
b. Subtraction : CF as a borrow-in indicator, when the subtraction operation must has a borrow, in the CF
will be "0", in another word, if no borrow-in, CF will be "1".
c. Comparision: CF is as a borrow-in indicator for Comparision operation as the same as subtraction
operation.
d. Rotation: CF shifts into the empty bit of accumulator for the rotation and holds the shift out data after
rotation.
e. CF test instruction : For TFCFC instruction, the content of CF sends into SF then clear itself "0".
For TTSFC instruction, the content of CF sends into SF then set itself "1".
(2) Zero Flag ( ZF )
ZF is affected by the result of ALU, if the ALU operation generate a "0" result, the ZF will be "1",
otherwise, the ZF will be "0".
(3) Status Flag ( SF )
The SF is affected by instruction operation and system status.
a. SF is initiated to "1" for reset condition.
b. Branch instruction is decided by SF, when SF=1, branch condition will be satisified, otherwise,
branch condition will not be satisified by SF = 0.
@ (4) General Flag ( GF )
GF is a one bit general purpose register which can be set, clear, test by instruction SGF, CGF and TGS.
PROGRAM EXAMPLE:
Check following arithematic operation for CF, ZF, SF
@ : just for 4K ROM.
* This specification are subject to be changed without notice.
12.26.2001 11
11 Page | ||
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| PDF Descargar | [ Datasheet EM73461B.PDF ] | |
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