CY7C64013-PC Cypress Semiconductor Corp, CY7C64013-PC Datasheet - Page 17

• Manufacturer Part Number: CY7C64013-PC
• Description: IC MCU 8K FULL SPEED USB 28DIP
• Manufacturer: Cypress Semiconductor Corp
• Series: M8™r

Specifications of CY7C64013-PC

• Applications: USB Microcontroller
• Core Processor: M8C
• Program Memory Type: OTP (8 kB)
• Controller Series: CY7C640xx
• Ram Size: 256 x 8
• Interface: I²C, USB, HAPI
• Number Of I /o: 19
• Voltage - Supply: 4 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.300", 7.62mm)
• For Use With: 428-1339 - KIT LOW SPEED PERSONALITY BOARD
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1326

6.0
The XTALIN and XTALOUT are the clock pins to the microcontroller. The user can connect an external oscillator or a crystal to
these pins. When using an external crystal, keep PCB traces between the chip leads and crystal as short as possible (less than
2 cm). A 6-MHz fundamental frequency parallel resonant crystal can be connected to these pins to provide a reference frequency
for the internal PLL. The two internal 30-pF load caps appear in series to the external crystal and would be equivalent to a 15-pF
load. Therefore, the crystal must have a required load capacitance of about 15–18 pF. A ceramic resonator does not allow the
microcontroller to meet the timing specifications of full speed USB and therefore a ceramic resonator is not recommended with
these parts.
An external 6-MHz clock can be applied to the XTALIN pin if the XTALOUT pin is left open. Grounding the XTALOUT pin when
driving XTALIN with an oscillator does not work because the internal clock is effectively shorted to ground.
7.0
The CY7C64x13 supports two resets: Power-On Reset (POR) and a Watchdog Reset (WDR). Each of these resets causes:
The occurrence of a reset is recorded in the Processor Status and Control Register, as described in Section 15.0. Bits 4 and 6
are used to record the occurrence of POR and WDR, respectively. Firmware can interrogate these bits to determine the cause
of a reset.
Program execution starts at ROM address 0x0000 after a reset. Although this looks like interrupt vector 0, there is an important
difference. Reset processing does NOT push the program counter, carry flag, and zero flag onto program stack. The firmware
reset handler should configure the hardware before the “main” loop of code. Attempting to execute a RET or RETI in the firmware
reset handler causes unpredictable execution results.
7.1
When V
state. During the semi-suspend state, which is different from the suspend state defined in the USB specification, the oscillator
and all other blocks of the part are functional, except for the CPU. This semi-suspend time ensures that both a valid V
reached and that the internal PLL has time to stabilize before full operation begins. When the V
2.5V, and the oscillator is stable, the POR is deasserted and the on-chip timer starts counting. The first 1 ms of suspend time is
not interruptible, and the semi-suspend state continues for an additional 95 ms unless the count is bypassed by a USB Bus Reset
on the upstream port. The 95 ms provides time for V
If a USB Bus Reset occurs on the upstream port during the 95-ms semi-suspend time, the semi-suspend state is aborted and
program execution begins immediately from address 0x0000. In this case, the Bus Reset interrupt is pending but not serviced
until firmware sets the USB Bus Reset Interrupt Enable bit (bit 0 of register 0x20) and enables interrupts with the EI command.
The POR signal is asserted whenever V
again. Behavior is the same as described above.
7.2
The Watchdog Timer Reset (WDR) occurs when the internal Watchdog timer rolls over. Writing any value to the write-only
Watchdog Restart Register at address 0x26 clears the timer. The timer rolls over and WDR occurs if it is not cleared within t
(8 ms minimum) of the last clear. Bit 6 of the Processor Status and Control Register is set to record this event (the register contents
are set to 010X0001 by the WDR). A Watchdog Timer Reset lasts for 2 ms, after which the microcontroller begins execution at
ROM address 0x0000.
Document #: 38-08001 Rev. *A
• all registers to be restored to their default states,
• the USB Device Address to be set to 0,
• all interrupts to be disabled,
• the PSP and Data Stack Pointer (DSP) to be set to memory address 0x00.
CC
Power-On Reset (POR)
Watchdog Reset (WDR)
Clocking
Reset
is first applied to the chip, the Power-On Reset (POR) signal is asserted and the CY7C64x13 enters a “semi-suspend”
XTALOUT
(pin 1)
XTALIN
(pin 2)
CC
Figure 6-1. Clock Oscillator On-Chip Circuit
drops below approximately 2.5V, and remains asserted until V
CC
to stabilize at a valid operating voltage before the chip executes code.
30 pF
30 pF
To Internal PLL
CC
has risen above approximately
CC
rises above this level
CY7C64013
CY7C64113
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CC
level is
WATCH