ZLF645E0H2864G Zilog, ZLF645E0H2864G Datasheet - Page 82

• Manufacturer Part Number: ZLF645E0H2864G
• Description: IC MCU 64K FLASH 1K RAM 28-SSOP
• Manufacturer: Zilog
• Series: Crimzon™ ZLFr

Specifications of ZLF645E0H2864G

• Core Processor: Z8 LXMC
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, WDT
• Number Of I /o: 24
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.9 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Oscillator Type: -
• Other names: 269-4719

Table 38. Flash Frequency High Byte Register (FFREQH)
PS026407-0408
Bit Position
[7:0]
Bit Position
[7:0]
Bits
Field
Reset
R/W
Address
Caution:
Flash Frequency High and Low Byte Registers
R/W
7
0
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 binary Flash Frequency value must contain two times the system clock fre-
quency (in kHz) and is calculated using the following equation:
Programming the Flash Frequency High and Low Byte Registers as per the formula given
provides a Flash programming time of approximately 55 μs and an erase time of approxi-
mately 10 ms.
Value
Value
Flash programming and erasure is not supported for system clock frequencies below
1 MHz or above 8 MHz. The Flash Frequency High and Low Byte registers must be
loaded with the correct value to ensure proper operation of the device.
FFREQ[15:0]
R/W
6
0
Description
SPROT7-SPROT0 —Sector Protection
Each bit corresponds to an 16-page Flash sector. For the ZLF645xxxxx64, all
bits are used. Only bits 3-0 are used in the ZLF645xxxxx32.
Description
FFREQH —Flash Frequency High Byte
High byte of the 16-bit Flash Frequency value.
=
R/W
{
FFREQH[7:0], FFREQL[7:0]
5
0
Bank F, Register address: 03H
R/W
4
0
FFREQH
R/W
3
0
}
(Table 38
=
2x
---------------------------------------------------------------------------------------
R/W
ZLF645 Series Flash MCUs
2
0
Flash Control Register Definitions
System Clock Frequency (Hz)
and
Product Specification
Table
R/W
1000
1
0
39) combine to
R/W
0
0
74