Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 163

• Manufacturer Part Number: Z8F042AHJ020SC00TR
• Description: IC ENCORE XP MCU FLASH 4K 28SSOP
• Manufacturer: Zilog
• Series: Encore!® XP®r

Specifications of Z8F042AHJ020SC00TR

• 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: 23
• 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 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Z8F042AHJ020SC00T

Table 82. Flash Frequency High Byte Register (FFREQH)
Table 83. Flash Frequency Low Byte Register (FFREQL)
BITS
FIELD
RESET
R/W
ADDR
PS022825-0908
BITS
FIELD
RESET
R/W
ADDR
Caution:
Flash Frequency High and Low Byte Registers
R/W
7
0
7
SPROT7-SPROT0—Sector Protection
Each bit corresponds to a 512 byte Flash sector. For the Z8F08xx devices, the upper 3 bits
must be zero. For the Z8F04xx devices all bits are used. For the Z8F02xx devices, the
upper 4 bits are unused. For the Z8F01xx devices, the upper 6 bits are unused.
The Flash Frequency High (FFREQH) and Low Byte (FFREQL) registers combine to
form a 16-bit value, FFREQ, to control timing for Flash program and erase operations.
The 16-bit binary Flash Frequency value must contain the system clock frequency (in
kHz) and is calculated using the following equation:
FFREQH—Flash Frequency High Byte
High byte of the 16-bit Flash Frequency value.
FFREQL—Flash Frequency Low Byte
Low byte of the 16-bit Flash Frequency value.
The Flash Frequency High and Low Byte registers must be loaded with the correct value
to ensure proper operation of the device. Also, Flash programming and erasure is not
supported for system clock frequencies below 20 kHz or above 20 MHz.
FFREQ[15:0]
R/W
6
0
6
=
R/W
{
FFREQH[7:0],FFREQL[7:0]
5
0
5
R/W
4
0
4
FFREQH
FFREQL
FFBH
FFAH
R/W
0
R/W
3
0
3
}
=
Z8 Encore! XP
System Clock Frequency
------------------------------------------------------ -
R/W
2
0
2
Product Specification
1000
R/W
1
0
1
®
F082A Series
Flash Memory
R/W
0
0
0
152