Z86D990 Datasheet, PDF (11/102 Pages) Zilog, Inc. – Low-Voltage Micro controllers with ADC

Z86D990/Z86D991 OTP and Z86L99X ROM
Low-Voltage Microcontrollers with ADC
4
Functional Block Diagram
Figure 1 shows the functional block diagram for the microcontrollers.
Register File
256 x 8-bit
Expanded
Register File
7
Port 2
0
7
8
Program
Memory
††
256 Bytes
P52 P53
CIN2 CREF2
Power Filter
V_{DD_padring}***
V_{DD_CORE}
Z8 Core
Machine
Timing
and
Instruction
Control
XTAL 1
XTAL 2
*
Port 4
0
7
Two Analog
Comparators
CIN1 CREF1
P51 P50
Controlled
Current
P43
Output
8
Port 5
0
8-Bit C/T
(Carrier)
16-Bit C/T
(Modulation)
8-Bit C/T
(General)
7
Port 6
**
0
*Controlled Current Output
**P6 is only in the Z86L990/Z86D990.
***In the 28-pin package, V_{DD_padring} and V_{DD_CORE}
are bonded together.
8-Bit A/D†
V_Ref+ V_Ref–
MUX
ADC0/P44
ADC1/P45
ADC2/P46
ADC3/P47
†ADC is only in the Z86L990/Z86D990.
††Program memory is as follows:
Z86D990 32K OTP
Z86D991 32K OTP
Z86L990 16K ROM
Z86L991 16K ROM
Figure 1. Functional Block Diagram
PS003807-1002
PRELIMINARY