HMS87C1808B Datasheet, PDF (74/99 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

HMS87C1X04B/08B/16B
Oscillator
(X_IN pin)
Internal
RC Clock
Internal
Clock
External
Interrupt
(or WDT Interrupt)
STOP Instruction Execution
BIT
Counter
N-2 N-1 N N+1
N+2
Normal Operation
STOP Mode
Clear Basic Interval Timer
00 01
FE FF 00 00
Stabilizing Time
t_ST > 20mS
Normal Operation
Figure 18-4 STOP Mode Releasing by External Interrupt or WDT Interrupt(using RCWDT)
Oscillator
(X_IN pin)
Internal
RC Clock
Internal
Clock
RESET
RESET by WDT
Internal
RESET
STOP Mode
STOP Instruction Execution
Time can not be control by software
Stabilizing Time
t_ST = 64mS @4MHz
Figure 18-5 STOP Mode Releasing by RESET(using RCWDT)
18.3 Wake-up Timer Mode
In the Wake-up Timer mode, the on-chip oscillator is not stopped.
Except the Prescaler(only 2048 devided ratio), Timer0 and
Timer2, all functions are stopped, but the on-chip RAM and Con-
trol registers are held. The port pins out the values held by their
respective port data register, port direction registers.
The Wake-up Timer mode is activated by execution of STOP
instruction after setting the bit WAKEUP of CKCTLR to
“1”. (This register should be written by byte operation. If this
register is set by bit manipulation instruction, for example
“set1” or “clr1” instruction, it may be undesired operation)
70
SEP. 2004 Ver 1.03