CY7C63231A-SXC Cypress Semiconductor Corp, CY7C63231A-SXC Datasheet - Page 18

• Manufacturer Part Number: CY7C63231A-SXC
• Description: IC MCU 3K USB LS PERIPH 18-SOIC
• Manufacturer: Cypress Semiconductor Corp
• Series: enCoRe™r

Specifications of CY7C63231A-SXC

• Applications: USB Microcontroller
• Core Processor: M8B
• Program Memory Type: OTP (3 kB)
• Controller Series: CY7C632xx
• Ram Size: 96 x 8
• Interface: USB
• Number Of I /o: 10
• Voltage - Supply: 3.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 18-SOIC (7.5mm Width)
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Package Type: SOIC
• Mounting: Surface Mount
• Processor Series: CY7C63xx
• Core: M8B
• Data Bus Width: 8 bit
• Program Memory Size: 3 KB
• Data Ram Size: 96 B
• Interface Type: PS2, USB
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 10
• Number Of Timers: 1
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 428-1719-5; CY7C63231A-SXC

Internal Clock saves the external oscillator start-up time and keeps that oscillator off for additional power savings. The external
oscillator mode can be activated when desired, similar to operation at power-up.
The sequence of events for these modes is as follows:
Wake in Internal Clock Mode:
Wake in External Clock Mode:
11.2
The wake-up timer runs whenever the wake-up interrupt is enabled, and is turned off whenever that interrupt is disabled.
Operation is independent of whether the device is in suspend mode or if the global interrupt bit is enabled. Only the Wake-up
Timer Interrupt Enable bit (Figure 19-1) controls the wake-up timer.
Once this timer is activated, it will give interrupts after its time-out period (see below). These interrupts continue periodically until
the interrupt is disabled. Whenever the interrupt is disabled, the wake-up timer is reset, so that a subsequent enable always
results in a full wake-up time.
The wake-up timer can be adjusted by the user through the Wake-up Timer Adjust bits in the Clock Configuration Register
(Figure 9-2). These bits clear on reset. In addition to allowing the user to select a range for the wake-up time, a firmware algorithm
can be used to tune out initial process and operating condition variations in this wake-up time. This can be done by timing the
wake-up interrupt time with the accurate 1.024-ms timer interrupt, and adjusting the Timer Adjust bits accordingly to approximate
the desired wake-up time.
Table 11-1. Wake-up Timer Adjust Settings
Document #: 38-08028 Rev. *B
1. Before entering suspend, clear bit 0 of the Clock Configuration Register. This selects Internal clock mode after suspend.
2. Enter suspend mode by setting the suspend bit of the Processor Status and Control Register.
3. After a wake-up event, the internal clock starts immediately (within 2 µs).
4. A time-out period of 8 µs passes, and then firmware execution begins.
5. At some later point, to activate External Clock mode, set bit 0 of the Clock Configuration Register. This halts the internal clocks
1. Before entering suspend, the external clock must be selected by setting bit 0 of the Clock Configuration Register. Make sure
2. Enter suspend mode by setting the suspend bit of the Processor Status and Control Register.
3. After a wake-up event, the external oscillator is started. The clock is monitored for stability (this takes approximately 50–100
4. After an additional time-out period (128 µs or 4 ms, see Section 9.0), firmware execution resumes.
while the external clock becomes stable. After an additional time-out (128 µs or 4 ms, see Section 9.0), firmware execution
resumes.
this bit is still set when suspend mode is entered. This selects External clock mode after suspend.
µs with a ceramic resonator).
(Bits [6:4] in Figure 9-2)
Wake-up Timer
Adjust Bits [2:0]
000 (reset state)
001
010
100
101
See Section 24.0 for the value of t
011
110
111
FOR
FOR
Wake-up Time
WAKE
128 * t
16 * t
32 * t
64 * t
1 * t
2 * t
4 * t
8 * t
WAKE
WAKE
WAKE
WAKE
WAKE
WAKE
WAKE
WAKE
CY7C63221/31A
enCoRe™ USB
Page 18 of 50
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