W77E058A40DL Nuvoton Technology Corporation of America, W77E058A40DL Datasheet - Page 9

• 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

6. MEMORY ORGANIZATION
The W77E058 separates the memory into two separate sections, the Program Memory and the Data
Memory. The Program Memory is used to store the instruction op-codes, while the Data Memory is
used to store data or for memory mapped devices.
6.1
The Program Memory on the W77E058 can be up to 64 Kbytes long. There is also on-chip ROM which
can be used similarly to that of the 8052, except that the ROM size is 32 Kbytes. All instructions are
fetched for execution from this memory area. The MOVC instruction can also access this memory
region. Exceeding the maximum address of on-chip ROM will access the external memory.
6.2
The W77E058 can access up to 64Kbytes of external Data Memory. This memory region is accessed
by the MOVX instructions. Unlike the 8051 derivatives, the W77E058 contains on-chip 1K bytes
MOVX SRAM of Data Memory, which can only be accessed by MOVX instructions. These 1K bytes of
SRAM are between address 0000H and 03FFH. Access to the on-chip MOVX SRAM is optional under
software control. When enabled by software, any MOVX instruction that uses this area will go to the
on-chip RAM. MOVX addresses greater than 03FFH automatically go to external memory through Port
0 and 2. When disabled, the 1KB memory area is transparent to the system memory map. Any MOVX
directed to the space between 0000H and FFFFH goes to the expanded bus on Port 0 and 2. This is
the default condition. In addition, the W77E058 has the standard 256 bytes of on-chip Scratchpad
RAM. This can be accessed either by direct addressing or by indirect addressing. There are also
some Special Function Registers (SFRs), which can only be accessed by direct addressing. Since the
Scratchpad RAM is only 256 bytes, it can be used only when data contents are small. In the event that
larger data contents are present, two selections can be used. One is on-chip MOVX SRAM , the other
is the external Data Memory. The on-chip MOVX SRAM can only be accessed by a MOVX instruction,
the same as that for external Data Memory. However, the on-chip RAM has the fastest access times.
FFh
80h
7Fh
00h
Program Memory
Data Memory
Addressing
Addressing
Direct &
Indirect
Indirect
RAM
RAM
03FFh
0000h
Addressing
Direct
SFRs
On-chip SRAM
1K Bytes
Figure 1. Memory Map
- 9 -
FFFFh
0000h
External
Memory
Bytes
64 K
Data
Publication Release Date: April 17, 2007
0000h
7FFFh
FFFFh
W77E058A
32K Bytes
Program
Memory
On-chip
Program
External
Memory
Revision A10