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PDF EM73469A Data sheet ( Hoja de datos )
| Número de pieza | EM73469A | |
| Descripción | 4-BIT MICRO-CONTROLLER FOR LCD PRODUCT | |
| Fabricantes | ELAN Microelectronics Corp | |
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EM73469A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
GENERAL DESCRIPTION
EM73469A is an advanced single chip CMOS 4-bit micro-controller. It contains 4K-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.
EM73469A also contains 6 interrupt sources, 1 input port, 2 bidirection ports, LCD display (32x4), and one high
speed timer/counter with melody output.
EM73469A has plentiful operating modes (SLOW, IDLE, STOP) intended to reduce the power consumption.
FEATURES
• Operation voltage : 1.2V to 1.8V.
• 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).
• Instruction set
: 109 powerful instructions.
• Instruction cycle time : Up to 2us for 4 MHz (high speed clock).
122 µs or 244µs by frequency double mask option for 32768 Hz (low speed clock).
• ROM capacity
: 4096 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). P4.0 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, 1/4, 1/3, 1/2 static six kinds of duty selectable, 1/2 bias, 1/3 bias.
• Power saving function : SLOW, IDLE, STOP operation mode.
• Package type
: Chip form 61 pins.
APPLICATIONS
EM73469A 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.
1.9.2001 1
1 page  
LCD display RAM:
EM73469A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
Increment
Address
00h~0Fh
zero page
10h~1Fh
20h~2Fh
30h~3Fh
LCD display RAM
40h~4Fh
:
B0h ~ BFh
C0h ~ CFh level 0 level 1 level 2
D0h ~ DFh level 4 level 5 level 6
E0h ~ EFh level 8 level 9 level A
F0h ~ F3h level C
level 3
level17
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.
1.9.2001 5
5 Page 
EM73469A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
(1) For instruction : LDL #k, LDH #k, THA, THL, INCL, DECL, EXAL, EXAH, HL register used as a
temporary register.
PROGRAM EXAMPLE: Load immediate data "5h" into L register, "Dh" into H register.
LDL #05h;
LDH #0Dh;
(2) For instruction LDAM, STAM, STAMI .., HL register used as a pointer for the address of RAM memory.
PROGRAM EXAMPLE: Store immediate data #Ah into RAM of address 35h.
LDL #5h;
LDH #3h;
STDMI #0Ah; RAM[35] ← Ah
(3) For instruction : SELP, CLPL, TFPL, L regieter be a pointer to indicate the bit of I/O port.
When LR = 0 indicate P4.0
PROGRAM EXAMPLE: To set bit 0 of Port4 to "1"
LDL #00h;
SEPL ; P4.0 ← 1
STACK POINTER (SP)
Stack pointer is a 4-bit register which stores the present stack level number.
Before using stack, user must set the SP value first, CPU will not initiate the SP value after reset condition
. When a new subroutine is accepted, the SP will be decreased one automatically, in another word, if
returning from a subroutine, the SP will be increased one.
The data transfer between ACC and SP is by instruction of "LDASP" and "STASP".
DATA POINTER (DP)
Data pointer is a 12-bit register which stores the address of ROM can indicate the ROM code data
specified by user (refer to data ROM).
CLOCK AND TIMING GENERATOR
The clock generator is supported by a single clock system, the clock source comes from crystal (resonator)
or RC oscillation is decided by mask option, the working frequency range is 480 K Hz to 4 MHz depending
on the working voltage.
CLOCK GENERATOR STRUCTURE
There are two clock generator for system clock control. P14 is the status register for the CPU status. P16,
P19 and P22 are the system clock mode control ports.
* This specification are subject to be changed without notice.
1.9.2001 11
11 Page | ||
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| PDF Descargar | [ Datasheet EM73469A.PDF ] | |
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