W77E058A40DL Nuvoton Technology Corporation of America, W77E058A40DL Datasheet - Page 43

• Manufacturer Part Number: W77E058A40DL
• Description: IC MCU 8-BIT 32K FLASH 40-DIP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: W77r

Specifications of W77E058A40DL

• Program Memory Type: FLASH
• Program Memory Size: 32KB (32K x 8)
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: EBI/EMI, Serial Port
• Peripherals: POR, WDT
• Number Of I /o: 32
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-DIP
• Cpu Family: W77
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 40MHz
• Interface Type: UART
• Total Internal Ram Size: 1KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Instruction Set Architecture: CISC
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 40
• Package Type: PDIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant

W77E058A
8.4
Wait State Control Signal
Either with the software using stretch value to change the required machine cycle of MOVX instruction,
the W77E058 provides another hardware signal WAIT to implement the wider duration of external
data access timing. This wait state control signal is the alternate function of P4.0 such that it can only
be invoked to 44-pin PLCC/QFP package type. The wait state control signal can be enabled by setting
WS (ROMMAP.7) bit. When enabled, the setting of stretch value decides the minimum length of
MOVX instruction cycle and the device will sample the WAIT pin at each C3 state before the rising
edge of read/write strobe signal during MOVX instruction. Once this signal being recongnized, one
more machine cycle (wait state cycle) will be inserted into next cycle. The inserted wait state cycles
are unlimited, so the MOVX instruction cycle will end in which the wait state control signal is
deactivated. Using wait state control signal allows a dynamically access timimg to a selected external
peripheral. The WS bit is accessed by the Timed Access Protection procedure.
Set WS bit ahd stretch value = 0 to enable wait signal.
Publication Release Date: April 17, 2007
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Revision A10