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KS86C6004/C6008/P6008 MICROCONTROLLER (Preliminary Spec)
RESET
and POWER-DOWN
8-1
8
RESET
and POWER-DOWN
SYSTEM RESET
OVERVIEW
During a power-on reset, the voltage at V
DD
is High level and the
RESET
pin is forced to Low level. The
RESET
signal is input through a Schmitt trigger circuit where it is then synchronized with the CPU clock. This brings the
KS86C6004/C6008/P6008 into a known operating status.
The
RESET
pin must be held to Low level for a minimum time interval after the power supply comes within
tolerance in order to allow time for internal CPU clock oscillation to stabilize. The minimum required oscillation
stabilization time for a reset is approximately 10ms (
≅
2
16
/
f
OSC
, f
OSC
= 6 MHz).
When a reset occurs during normal operation (with both V
DD
and
RESET
at High level), the signal at the
RESET
pin is forced Low and the reset operation starts. All system and peripheral control registers are then set to their
default hardware reset values (see Table 8-1).
The following sequence of events occurs during a reset operation:
— All interrupts are disabled.
— The watchdog function (basic timer) is enabled.
— Ports 0–4 are set to Schmitt trigger input mode and all pull-up resistors are disabled.
— Peripheral control and data registers are disabled and reset to their initial values.
— The program counter is loaded with the ROM reset address, 0100H.
— When the programmed oscillation stabilization time interval has elapsed, the address stored in ROM location
0100H (and 0101H) is fetched and executed.
NOTE
To program the duration of the oscillation stabilization interval, you must make the appropriate settings to
the basic timer control register, BTCON, before entering Stop mode. Also, if you do not want to use the
basic timer watchdog function (which causes a system reset if a basic timer counter overflow occurs),
you can disable it by writing '1010B' to the upper nibble of BTCON.
Содержание KS86C6004
Страница 19: ...ADDRESS SPACES KS86C6004 C6008 P6008 MICROCONTROLLER Preliminary Spec 2 8 NOTES ...
Страница 61: ...CONTROL REGISTERS KS86C6004 C6008 P6008 MICROCONTROLLER Preliminary Spec 4 30 NOTES ...
Страница 120: ...CLOCK CIRCUIT KS86C6004 C6008 P6008 MICROCONTROLLERS Preliminary Spec 7 4 NOTES ...
Страница 134: ...I O PORTS KS86C6004 C6008 P6008 MICROCONTROLLER Preliminary Spec 9 10 NOTES ...
Страница 143: ...KS86C6004 C6008 P6008 MICROCONTROLLER Preliminary Spec BASIC TIMER and TIMER 0 10 9 NOTES ...
Страница 162: ...KS86C6004 C6008 P6008 MICROCONTROLLER Preliminary Spec ELECTRICAL DATA 12 9 ...
Страница 164: ...KS86C6004 C6008 P6008 MICROCONTROLLER Preliminary Spec ELECTRICAL DATA 12 11 NOTES ...
Страница 172: ...KS86P6008 OTP KS86C6004 C6008 P6008 MICROCONTROLLER Preliminary Spec 14 6 NOTES ...