EM73461A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
PIN DESCRIPTIONS
Symbol
Pin-type
Function
SOUND disable, low current push-pull
SOUND disable, normal current push-pull
SOUND disable, high current push-pull
1-bit bidirection I/O port with HTC external input
P4.1/TRGH
P4(2,3)
I/O-Q
mask option :
NMOS open-drain
PMOS open-drain
low current push-pull
normal current push-pull
high current push-pull
I/O-Q
2-bit bidirection I/O port with high current source
mask option :
NMOS open-drain
PMOS open-drain
low current push-pull
normal current push-pull
high current push-pull
P8.0(INT1)/WAKEUPA, I/O-S
P8.2(INT0)/WAKEUPC
2-bit bidirection I/O port with external interrupt source input and IDLE
releasing function
mask option :
wakeup enable, low current push-pull
wakeup enable, normal current push-pull
wakeup disable, open-drain
wakeup disable, low current push-pull
wakeup disable, normal current push-pull
P8.1(TRGB)/WAKEUPB I/O-S
P8.3(TRGA)/WAKEUPD
2-bit bidirection I/O port with time/counter A,B external input and IDLE
releasing function
mask option :
wakeup enable, low current push-pull
wakeup enable, normal current push-pull
wakeup disable, open-drain
wakeup disable, low current push-pull
wakeup disable, normal current push-pull
SOUND
Melody output
VA,VB, V1, V2, V3
COM0~COM3
SEG0~SEG31
TEST
Connect the capacitors for LCD bias voltage
LCD common output pins
LCD segment output pins
Tie Vss as package type, no connecting as COB type.
FUNCTION DESCRIPTIONS
PROGRAM ROM (4K X 8 bits)
4 K x 8 bits program ROM contains user's program and some fixed data.
The basic structure of program ROM can be divided into 5 parts.
1. Address 000h: Reset start address.
2. Address 002h - 00Ch : 6 kinds of interrupt service routine entry addresses.
3. Address 00Eh-086h : SCALL subroutine entry address, only available at 00Eh,016h,01Eh,026h, 02Eh,
036h, 03Eh, 046h, 04Eh, 056h, 05Eh, 066h, 06Eh, 076h, 07Eh, 086h.
4. Address 000h - 7FFh : LCALL subroutine entry address.
5. Address 000h - FFFh : Except used as above function, the other region can be used as user's program region.
* This specification are subject to be changed without notice.
1.5.2001
3
ELAN [ ELAN MICROELECTRONICS CORP ]
