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KS57C0404 Datasheet(PDF) 6 Page - Samsung semiconductor

Part No. KS57C0404
Description  The KS57C0404/C0408 single-chip CMOS microcontroller has been designed for very high-performance using Samsungs newest 4-bit CPU core, SAM47 (Samsung
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Manufacturer  SAMSUNG [Samsung semiconductor]
Direct Link  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

KS57C0404 Datasheet(HTML) 6 Page - Samsung semiconductor

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PRODUCT OVERVIEW
KS57C0404/C0408/P0408 MICROCONTROLLER
1–6
POWER-DOWN
To reduce power consumption, there are two power-down modes: idle and stop. The IDLE instruction initiates idle
mode and the STOP instruction initiates stop mode.
In idle mode, only the CPU clock stops while peripherals and the oscillation source continue to operate normally.
Stop mode effects only the system clock. In stop mode system clock oscillation stops completely, halting all
operations except for a few basic peripheral functions. RESET or an interrupt (with the exception of INT0) can be
used to terminate either idle or stop mode.
RESET
When a RESET signal occurs during normal operation or during power-down mode, the CPU enters idle mode
when the reset operation is initiated. When the standard oscillation stabilization interval (31.3 ms at 4.19 MHz)
has elapsed, normal CPU operation resumes.
I/O PORTS
The KS57C0404/C0408 has 9 I/O ports. Pin addresses for all I/O ports are mapped to locations FF0H–FFCH in
bank 15 of the RAM.
There are 4 input pins, 24 configurable I/O pins, and 8 software n-channel open-drain I/O pins, for a total of 36
I/O pins. The contents of I/O port pin latches can be read, writen, or tested at the corresponding address using
bit manipulation instructions.
TIMERS AND TIMER/COUNTERS
The timer function has four main components: an 8-bit basic interval timer, two 8-bit timer/counters, and a watch
timer. The 8-bit basic timer generates interrupt requests at precise intervals, based on the selected CPU clock
frequency.
The programmable 8-bit timer/counters are used for external event counting, generation of arbitrary clock
frequencies for output, and dividing external clock signals. The 8-bit timer/counter 0 generates a clock signal
(SCK) for the serial I/O interface.
The watch timer has an 8-bit watch timer mode register, a clock selector, and a frequency divider circuit. Its
functions include real-time and watch-time measurement, and frequency outputs for buzzer sound.
SERIAL I/O INTERFACE
The serial I/O interface supports the transmission or reception of 8-bit serial data with an external device. The
serial interface has the following functional components:
 8-bit mode register
 Clock selector circuit
 8-bit buffer register
 3-bit serial clock counter
The serial I/O circuit can be set either to transmit-and-receive or to receive-only mode. MSB-first or LSB-first
transmission is also selectable. The serial interface operates with an internal or an external clock source, or using
the clock signal generated by the 8-bit timer/counter 0. To modify transmission frequency, the appropriate bits in
the serial I/O mode register (SMOD) must be manipulated.


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