Z86D99 ZILOG [Zilog, Inc.], Z86D99 Datasheet - Page 68

• Manufacturer Part Number: Z86D99
• Description: Low-Voltage Micro controllers with ADC
• Manufacturer: ZILOG [Zilog, Inc.]

PS003807-1002
Bit
Bit/Field
R/W
Reset
R = Read, W = Write, X = Indeterminate
Bit
Position
7_______
_6______
__5_____
___4____
____32__
______1_
_______0
Analog-to-Digital Converter Control Registers
The Z86D99/Z86L99 family features an 8-bit analog-to-digital converter with
external voltage references. The output of the ADC is stored in the ADC Data
Register, as shown in Table 20. The ADC is configured using the ADC Control
Register, as shown in Table 19.
Table 19. ADCCTRL Register (Group/Bank 0Fh, Register 8)
ADC Control Register (ADCCTRL)
The ADCCTRL register controls the operation of the analog-to-digital converter.
Bits 2 and 3 of the ADCCTRL register determine which of the four analog input
channels feeds into the ADC at any given time. Bits 4 through 7 enable or disable
the digital input buffer. When configured as an ADC input channel, the port has to
be configured in Input Mode and with the digital input buffer disabled.
7
P47_
A/D
R/W
0
Bit/Field
P47_A/D
P46_A/D
P45_A/D
P44_A/D
Channel
Selection
A/D_PowerON
ADC Clock Select R/W
P
6
P46_
A/D
R/W
0
R
E
L
5
P45_
A/D
R/W
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
I
M
Z86D990/Z86D991 OTP and Z86L99X ROM
4
P44_
A/D
R/W
0
Value
1
0
1
0
1
0
1
0
11
10
01
00
1
0
1
0
I
Low-Voltage Microcontrollers with ADC
N
A
3
Channel
Selection
R/W
0
Description
P47 configured as A/D Input
P47 configured as digital input
P46 configured as A/D Input
P46 configured as digital input
P45 configured as A/D Input
P45 configured as digital input
P44 configured as A/D Input
P44 configured as digital input
Channel 3 (P47)
Channel 2 (P46)
Channel 1 (P45)
Channel 0 (P44)
ON
OFF
SCLK/2
SCLK
R
Y
2
R/W
0
1
A/D Pwr
On
R/W
0
0
ADC
Clock
Select
R/W
0
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