GMS30004 Datasheet, PDF (18/158 Pages) Hynix Semiconductor – 4-BIT SINGLE CHIP MICROCOMPUTERS

Chapter 1. Introduction
Masked options
The GMS300 series offer the following optional features.
These options are masked.
1. Watch dog timer reset by REMOUT output signal.
2. Input terminals having STOP release mode : K0~K3, R0~R3.
3. I/O terminals having pull-up resistor : R0~R3
4. Ceramic oscillation circuit contained (or not contained).
5. Output form at stop mode
D0~D7 : ÌLÌ or keep before stop mode
STOP Function
Stop mode can be achieved by STOP instructions.
In stop mode :
1. Oscillator is stopped, the operating current is low.
2. Watch dog timer is reset, D8~D9 output and REMOUT output are ÌLÌ.
3. Part other than WDT, D8~D9 output and REMOUT output have a value before
come into stop mode.
ÌBut, the state of D0~D7 output in stop mode is able to choose as masked
option. ÌLÌ output or same level before come into stop mode.
The function to release stop mode is able to choose each bit of K or R input.
Stop mode is released when one of K or R input is going to ÌLÌ.
1. State of D0~D7 output and REMOUT output is return to state of before stop mode
is achieved.
Ø 2. After 1024 8 enable clocks for stable oscillating. First instruction start to operate.
3. In return to normal operation, WDT is counted from zero again.
But, at executing stop instruction, if one of K or R input is chosen to ÌLÌ, stop
instruction is same to NOP instruction.
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