C8051F930-GQ Silicon Laboratories Inc, C8051F930-GQ Datasheet - Page 117

• Manufacturer Part Number: C8051F930-GQ
• Description: IC 8051 MCU 64K FLASH 32-LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F9xxr

Specifications of C8051F930-GQ

• Program Memory Type: FLASH
• Program Memory Size: 64KB (64K x 8)
• Package / Case: 32-LQFP
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 24
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 0.9 V ~ 3.6 V
• Data Converters: A/D 23x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: C8051F9x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 4.25 KB
• Interface Type: I2C/SMBus/SPI/UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 4
• Operating Supply Voltage: 0.9 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F930DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 23-ch x 10-bit
• No. Of I/o's: 24
• Ram Memory Size: 4KB
• Cpu Speed: 25MHz
• No. Of Timers: 4
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 336-1478 - PLATFORM PROG TOOLSTCK F920,F930336-1477 - PLATFORM PROG TOOLSTCK F920,F930336-1473 - KIT DEV C8051F920,F921,F930,F931336-1472 - BOARD TARGET/PROTO W/C8051F930
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1466

10.5. External Memory Interface Operating Modes
The external data memory space can be configured in one of four operating modes, shown in Figure 10.3,
based on the EMIF Mode bits in the EMI0CF register (SFR Definition 10.2). These modes are summarized
below. Timing diagrams for the different modes can be found in Section “10.6. External Memory Interface
Timing” on page 118.
10.5.1. Internal XRAM Only
When EMI0CF.[3:2] are set to 00, all MOVX instructions will target the internal XRAM space on the device.
Memory accesses to addresses beyond the populated space will wrap, and will always target on-chip
XRAM. As an example, if the entire address space is consecutively written and the data pointer is
incremented after each write, the write pointer will always point to the first byte of on-chip XRAM after the
last byte of on-chip XRAM has been written.
•
•
10.5.2. Split Mode without Bank Select
When EMI0CF.[3:2] are set to 01, the XRAM memory map is split into two areas, on-chip space and off-
chip space.
•
•
•
•
EMI0CF[3:2] = 00
On-Chip XRAM
On-Chip XRAM
On-Chip XRAM
On-Chip XRAM
On-Chip XRAM
On-Chip XRAM
8-bit MOVX operations use the contents of EMI0CN to determine the high-byte of the effective address
and R0 or R1 to determine the low-byte of the effective address.
16-bit MOVX operations use the contents of the 16-bit DPTR to determine the effective address.
Effective addresses below the on-chip XRAM boundary will access on-chip XRAM space.
Effective addresses above the on-chip XRAM boundary will access off-chip space.
8-bit MOVX operations use the contents of EMI0CN to determine whether the memory access is on-
chip or off-chip. However, in the “No Bank Select” mode, an 8-bit MOVX operation will not drive the
upper 4-bits A[11:8] of the Address Bus during an off-chip access. This allows the user to manip-
ulate the upper address bits at will by setting the Port state directly via the port latches. This behavior
is in contrast with “Split Mode with Bank Select” described below. The lower 8-bits of the Address Bus
A[7:0] are driven, determined by R0 or R1.
16-bit MOVX operations use the contents of DPTR to determine whether the memory access is on-
chip or off-chip, and unlike 8-bit MOVX operations, the full 12-bits of the Address Bus A[11:0] are
driven during the off-chip transaction.
0xFFFF
0x0000
EMI0CF[3:2] = 01
(No Bank Select)
On-Chip XRAM
Off-Chip
Memory
Figure 10.3. EMIF Operating Modes
0xFFFF
0x0000
Rev. 1.1
EMI0CF[3:2] = 10
On-Chip XRAM
(Bank Select)
C8051F93x-C8051F92x
Off-Chip
Memory
0xFFFF
0x0000
EMI0CF[3:2] = 11
Off-Chip
Memory
0xFFFF
0x0000
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