EM73A89B Просмотр технического описания (PDF) - ELAN Microelectronics
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EM73A89B Datasheet PDF : 58 Pages
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EM73A89B
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
SYSTEM CLOCK MODE CONTROL
The system clock mode controller can start or stop the high-frequency and low-frequency clock oscillator
and switch between the basic clocks. EM73A89B has four operation modes (DUAL, SLOW, IDLE and
STOP operation modes).
STOP
operation
mode
High osc : stopped
Low osc : stopped
RESET
operation
Reset
I/O wakeup
Command
(P16)
Reset
NORMAL
operation
mode
High osc : oscillating
Low osc : oscillating
Command
(P22)
Reset release
Command
(P22)
Command
(P16)
Reset
SLOW
operation
mode
Reset
Command
(P19)
High osc : stopped
Low osc : oscillating
I/O or internal timer wakeup
IDLE
(CPU
stops)
Operation Mode
NORMAL
SLOW
IDLE
STOP
High osc : stopped
Low osc : oscillating
Oscillator
High, Low frequency
Low frequency
Low frequency
None
System Clock
High frequency clock
Low frequency clock
CPU stops
CPU stops
Available function
LCD, speech, HTC.
LCD, HTC
LCD
All disable
One instruction cycle
8 / fc
4 / fs
-
-
DUAL OPERATION MODE
The 4-bit µc is in the DUAL operation mode when the CPU is reseted. This mode is dual clock system
(high-frequency and low-frequency clocks oscillating). It can be changed to SLOW or STOP operation
mode with the command register (P22 or P16).
LCD display, speech synthesizer and sound generator are available for the DUAL operation mode.
SLOW OPERATION MODE
The SLOW operation mode is single clock system (low-frequency clock oscillating). It can be changed to
the DUAL operation mode with the command register (P22), STOP operation mode with P16 and IDEL
operation mode with P19.
LCD display is available for the SLOW operation mode. Speech synthesizer and sound generator are
disabled in this mode.
* This specification are subject to be changed without notice.
8.16.2001 16
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