Z8F042AHH020EG Zilog, Z8F042AHH020EG Datasheet - Page 174

• Manufacturer Part Number: Z8F042AHH020EG
• Description: IC ENCORE XP MCU FLASH 4K 20SSOP
• Manufacturer: Zilog
• Series: Encore!® XP®r

Specifications of Z8F042AHH020EG

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: IrDA, UART/USART
• Peripherals: Brown-out Detect/Reset, LED, LVD, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 17
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 7x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 269-4156; Z8F042AHH020EG

Table 86. Flash Sector Protect Register (FPROT)
PS022517-0508
BITS
FIELD
RESET
R/W
ADDR
R/W1 = Register is accessible for Read operations. Register can be written to 1 only (using user code).
Flash Sector Protect Register
Flash Frequency High and Low Byte Registers
Caution:
SECT7
7
INFO_EN—Information Area Enable
0 = Information Area is not selected.
1 = Information Area is selected. The Information area is mapped into the
PAGE—Page Select
This 7-bit field selects the Flash memory page for Programming and Page Erase
operations. Flash Memory Address[15:9] = PAGE[6:0].
The Flash Sector Protect Register
programmed or erased from user code. The Flash Sector Protect Register shares its
Register File address with the Page Select Register. The Flash Sector Protect Register can
be accessed only after writing the Flash Control Register with
write bits in this register to 1 (bits cannot be cleared to 0 by user code).
SECTn—Sector Protect
0 = Sector n can be programmed or erased from user code.
1 = Sector n is protected and cannot be programmed or erased from user code.
The Flash Frequency High and Low Byte Registers
form a 16-bit value, FFREQ, to control timing for Flash program and erase operations.
The 16-bit Flash Frequency registers must be written with the system clock frequency in
kHz for Program and Erase operations. The Flash Frequency value is calculated using the
following equation:
User code can only write bits from 0 to 1.
FFREQ[15:0]
Flash Memory address space at addresses
Flash programming and erasure is not supported for system clock frequen-
cies below 20 kHz, above 20 MHz, or outside of the valid operating
SECT6
6
=
{
FFREQH[7:0],FFREQL[7:0]
SECT5
5
SECT4
(Table
4
R/W1
FF9H
86) protects Flash memory sectors from being
0
SECT3
FE00H
}
3
=
System Clock Frequency
----------------------------------------------------------------- -
(Table 87
through
Z8 Encore! XP
SECT2
2
1000
and
FFFFH
5EH
Product Specification
Table
. User code can only
SECT1
.
1
®
88) combine to
F0822 Series
Flash Memory
SECT0
0
161