Z8F042AHH020EG Zilog, Z8F042AHH020EG Datasheet - Page 120

• 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 61. UART Baud Rates
PS022517-0508
10.0 MHz System Clock
Desired
Rate
(kHz)
1250.0
625.0
250.0
115.2
57.6
38.4
19.2
9.60
4.80
2.40
1.20
0.60
0.30
BRG
Divisor
(Decimal)
For a given UART data rate, the integer baud rate divisor value is calculated using the
following equation:
The baud rate error relative to the desired baud rate is calculated using the following
equation:
For reliable communication, the UART baud rate error must never exceed 5 percent.
Table 61
used crystal oscillator frequencies.
UART Baud Rate Divisor Value (BRG)
UART Baud Rate Error (%)
1042
2083
N/A
130
260
521
16
33
65
11
1
3
5
provides information on data rate errors for popular baud rates and commonly
Actual Rate Error
(kHz)
208.33
625.0
125.0
56.8
39.1
18.9
9.62
4.81
2.40
1.20
0.60
0.30
N/A
(%)
-16.67
-1.36
-0.03
-0.03
-0.03
0.00
8.51
1.73
0.16
0.16
0.16
N/A
0.2
=
100x
5.5296 MHz System Clock
Desired
Rate
(kHz)
⎛
⎝
Actual Data Rate Desired Data Rate
--------------------------------------------------------------------------------------------------- -
=
1250.0
625.0
250.0
115.2
57.6
38.4
19.2
9.60
4.80
2.40
1.20
0.60
0.30
Round
Universal Asynchronous Receiver/Transmitter
Desired Data Rate
⎛
⎝
System Clock Frequency (Hz)
------------------------------------------------------------------------------ -
BRG
Divisor
(Decimal)
16xUART Data Rate (bits/s)
1152
Z8 Encore! XP
N/A
N/A
144
288
576
18
36
72
–
1
3
6
9
Product Specification
Actual Rate Error
(kHz)
345.6
115.2
57.6
38.4
19.2
9.60
4.80
2.40
1.20
0.60
0.30
N/A
N/A
®
F0822 Series
⎞
⎠
(%)
38.24
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
N/A
N/A
⎞
⎠
107