Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 181

• 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

PS022825-0908
Table 103. Write Status Byte
BITS
FIELD
DEFAULT
VALUE
Byte Read
resides in working register R0. The bit fields of this status byte are defined in
The contents of the status byte are undefined for write operations to illegal addresses.
Also, user code must pop the address and data bytes off the stack.
The write routine uses 13 bytes of stack space in addition to the two bytes of address and
data pushed by the user. Sufficient memory must be available for this stack usage.
Because of the Flash memory architecture, NVDS writes exhibit a non-uniform execution
time. In general, a write takes 251 μs (assuming a 20 MHz system clock). Every 400 to
500 writes, however, a maintenance operation is necessary. In this rare occurrence, the
write takes up to 61 ms to complete. Slower system clock speeds result in proportionally
higher execution times.
NVDS byte writes to invalid addresses (those exceeding the NVDS array size) have no
effect. Illegal write operations have a 2 μs execution time.
To read a byte from the NVDS array, user code must first push the address onto the stack.
User code issues a
the return from the sub-routine, the read byte resides in working register R0, and the read
status byte resides in working register R1. The contents of the status byte are undefined for
7
0
Reserved—Must be 0.
RCPY—Recopy Subroutine Executed
A recopy subroutine was executed. These operations take significantly longer than a
normal write operation.
PF—Power Failure Indicator
A power failure or system reset occurred during the most recent attempted write to the
NVDS array.
AW—Address Write Error
An address byte failure occurred during the most recent attempted write to the NVDS
array.
DWE—Data Write Error
A data byte failure occurred during the most recent attempted write to the NVDS
array.
6
0
Reserved
CALL
instruction to the address of the byte-read routine (0x1000). At
5
0
4
0
RCPY
3
0
Z8 Encore! XP
PF
2
0
Product Specification
Non-Volatile Data Storage
AWE
1
0
®
F082A Series
Table
DWE
0
0
103.
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