EZ80F91AZA50EG Zilog, EZ80F91AZA50EG Datasheet - Page 110

• Manufacturer Part Number: EZ80F91AZA50EG
• Description: IC ACCLAIM MCU 256KB 144LQFP
• Manufacturer: Zilog
• Series: eZ80® AcclaimPlus!™r

Specifications of EZ80F91AZA50EG

• 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-LQFP
• Processor Series: EZ80F91x
• Core: eZ80
• Data Bus Width: 8 bit
• Data Ram Size: 16 KB
• Interface Type: I2C, IrDA, SPI
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 4
• Operating Supply Voltage: 3 V to 3.6 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: eZ80F910300ZCOG
• 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: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details
• Other names: 269-4563

PS027001-0707
Information Page Characteristics
Flash Control Registers
As noted earlier, the information page is not accessible using memory access instructions
and must be accessed via the FLASH_DATA I/O register. The Flash Page Select Register
contains a bit which selects the information page for I/O access.
There are two ways to erase the information page. You must set the FLASH_PAGE regis-
ter(0x00FC) bit7(INFO_EN) and then you execute either a MASS ERASE (which also
erases the entire main Flash memory array) operation or a PAGE ERASE operation.
The Flash Control Register interface contains all the registers used in Flash memory. The
definitions in this section describe each register.
Flash Key Register
Writing the two-byte sequence B6h, 49h in immediate succession to this register unlocks
the Flash Divider and Flash Write/Erase Protection registers. If these values are not
written by consecutive CPU I/O Writes (I/O reads and memory Read/Writes have no
effect), the Flash Divider and Flash Write/Erase Protection registers remain locked. This
prevents accidental overwrites of these critical Flash control register settings. Writing a
value to either the Flash Frequency Divider Register or the Flash Write/Erase Protection
Register automatically relocks both of the registers. See
Table 35. Flash Key Register
Bit
Reset
CPU Access
Note: W = Write Only.
Bit
Position
[7:0]
FLASH_KEY
Value Description
B6h,
49h
Sequential Write operations of the values B6h, 49h to this
register will unlock the Flash Frequency Divider and Flash
Write/Erase Protection registers.
W
7
0
(FLASH_KEY = 00F5h)
W
6
0
W
5
0
W
4
0
Table
W
3
0
35.
Product Specification
W
2
0
eZ80F91 ASSP
W
1
0
Flash Memory
W
0
0
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