EZ80F91NA050EC Zilog, EZ80F91NA050EC Datasheet - Page 104

• Manufacturer Part Number: EZ80F91NA050EC
• Description: IC ACCLAIM MCU 256KB 144-BGA
• Manufacturer: Zilog
• Series: eZ80® Acclaim!®r

Specifications of EZ80F91NA050EC

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 50MHz
• Connectivity: Ethernet, I²C, IrDA, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 144-LBGA
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 16 bit
• Operating Supply Voltage: 3 V to 3.6 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• For Use With: 269-4712 - KIT DEV ENCORE 32 SERIES269-4671 - BOARD ZDOTS SBC Z80ACCLAIM PLUS269-4561 - KIT DEV FOR EZ80F91 W/C-COMPILER269-4560 - KIT DEV FOR EZ80F91 W/C-COMPILER
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: No
• Other names: 269-3250

PS019215-0910
RAM Address Upper Byte Register
The RAM_ADDR_U register defines the upper byte of the address for on-chip RAM. 
If enabled, RAM addresses assume priority over all Chip Selects. The external Chip Select
signals are not asserted if the corresponding RAM address is enabled. See
Table 33. RAM Address Upper Byte Register
Bit
Reset
CPU Access
Note: R/W = Read/Write.
Bit 
Position
[7:0]
RAM_ADDR_U
Value Description
00h–
FFh
R/W
This byte defines the upper byte of the RAM address. When
enabled, the general-purpose RAM address space ranges from
{RAM_ADDR_U, E000h} to {RAM_ADDR_U, FFFFh}. When
enabled, the EMAC RAM address space ranges from
{RAM_ADDR_U, C000h} to {RAM_ADDR_U, DFFFh}.
7
1
R/W
6
1
R/W
5
1
R/W
4
1
(RAM_ADDR_U = 00B5h)
R/W
3
1
Product Specification
Random Access Memory
R/W
2
1
eZ80F91 MCU
Table
R/W
1
1
33.
R/W
0
1
95