Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 158

• 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
Caution:
Byte Programming
Page Erase
Mass Erase
the OCD or via the Flash Controller Bypass mode are unaffected. After a bit of the Sector
Protect Register has been set, it cannot be cleared except by powering down the device.
The Flash Memory is enabled for byte programming after unlocking the Flash Controller
and successfully enabling either Mass Erase or Page Erase. When the Flash Controller is
unlocked and Mass Erase is successfully completed, all Program Memory locations are
available for byte programming. In contrast, when the Flash Controller is unlocked and
Page Erase is successfully completed, only the locations of the selected page are available
for byte programming. An erased Flash byte contains all 1’s (
operation can only be used to change bits from 1 to 0. To change a Flash bit (or multiple
bits) from 0 to 1 requires execution of either the Page Erase or Mass Erase commands.
Byte Programming can be accomplished using the On-Chip Debugger's Write Memory
command or eZ8 CPU execution of the LDC or LDCI instructions. Refer to the eZ8 CPU
User Manual (available for download at www.zilog.com) for a description of the LDC and
LDCI instructions. While the Flash Controller programs the Flash memory, the eZ8 CPU
idles but the system clock and on-chip peripherals continue to operate. To exit program-
ming mode and lock the Flash, write any value to the Flash Control register, except the
Mass Erase or Page Erase commands.
The Flash memory can be erased one page (512 bytes) at a time. Page Erasing the Flash
memory sets all bytes in that page to the value
fies the page to be erased. Only a page residing in an unprotected sector can be erased.
With the Flash Controller unlocked and the active page set, writing the value
Flash Control register initiates the Page Erase operation. While the Flash Controller exe-
cutes the Page Erase operation, the eZ8 CPU idles but the system clock and on-chip
peripherals continue to operate. The eZ8 CPU resumes operation after the Page Erase
operation completes. If the Page Erase operation is performed using the On-Chip Debug-
ger, poll the Flash Status register to determine when the Page Erase operation is complete.
When the Page Erase is complete, the Flash Controller returns to its locked state.
The Flash memory can also be Mass Erased using the Flash Controller, but only by using
the On-Chip Debugger. Mass Erasing the Flash memory sets all bytes to the value
With the Flash Controller unlocked and the Mass Erase successfully enabled, writing the
The byte at each address of the Flash memory cannot be programmed (any bits written
to 0) more than twice before an erase cycle occurs. Doing so may result in corrupted
data at the target byte.
FFH
. The Flash Page Select register identi-
Z8 Encore! XP
FFH
Product Specification
). The programming
®
F082A Series
Flash Memory
95h
to the
FFH
.
147