EM73P461A
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
fc
High-frequency
P14
P16
generator
CLK
System clock
mode control
LXIN
fs
P19
P22
Low-frequency
generator
LXOUT
Mask option for choose Crystal or RC oscillator
LXIN
System control
LXIN
LXOUT
Crystal connection
RC connection
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. EM73P461A has four operation modes (NORMAL, SLOW,IDLE
STOP operation modes).
and
STOP
operation
mode
High osc : stopped
Low osc : stopped
Command
(P16)
I/O wakeup
Reset
High osc : oscillating
Low osc : oscillating
NORMAL
operation
mode
Command
(P16)
Reset
Command
(P22)
Command
(P22)
Reset release
RESET
operation
Reset
SLOW
operation
mode
High osc : stopped
Low osc : oscillating
Command
(P19)
Reset
I/O or internal timer wakeup
IDLE
(CPU
stops)
High osc : stopped
Low osc : oscillating
Operation Mode
NORMAL
SLOW
Oscillator
System Clock
Available function One instruction cycle
8/fc
LCD, High speed timer 4/fs or 8/fs by mask option
High, Low frequency High frequency clock LCD, High speed timer
Low frequency
Low frequency
None
Low frequency clock
CPU stops
CPU stops
IDLE
STOP
LCD
-
-
All disable
* This specification are subject to be changed without notice.
12.27.2001
16
ELAN [ ELAN MICROELECTRONICS CORP ]
