Z86D99 ZILOG [Zilog, Inc.], Z86D99 Datasheet - Page 59
Z86D99
Manufacturer Part Number
Z86D99
Description
Low-Voltage Micro controllers with ADC
Manufacturer
ZILOG [Zilog, Inc.]
Datasheet
1.Z86D99.pdf
(102 pages)
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Control and Status Registers
PS003807-1002
Register Summary
The Z86D99/Z86L99 family has 4 I/O port registers, 33 status and control regis-
ters, and 233 general-purpose RAM registers. The I/O port and control registers
are included in the general-purpose register memory to allow any Z8 instruction to
process I/O or control information directly, thus eliminating the requirement for
special I/O or control instructions. The Z8 instruction set permits direct access to
any of these 37 registers. In addition, each of the 233 general-purpose registers
can also function as an accumulator, an address pointer, or an index register.
Registers identified as “Reserved” do not exist or have not been implemented in
this design.
Table 10 through Table 13 summarize the name and location of all registers. The
register-by-register descriptions follow this section.
Table 10. I/O Port Registers (Group 0, Bank 0, Registers 0–F)
Grp/Bnk Reg
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
( 00h )
rF
rE
rD
rC
rB
rA
r9
r8
r7
r6
r5
r4
r3
r2
r1
r0
P
Register Function
General-Purpose RAM Register
General-Purpose RAM Register
General-Purpose RAM Register
General-Purpose RAM Register
General-Purpose RAM Register
General-Purpose RAM Register
General-Purpose RAM Register
General-Purpose RAM Register
Analog/Digital Converted Data
Port 6 Control Register
Port 5 Control Register
Port 4 Control Register
Reserved
Port 2 Control Register
Reserved
Reserved
R
E
L
I
M
Z86D990/Z86D991 OTP and Z86L99X ROM
I
Low-Voltage Microcontrollers with ADC
N
A
R
Y
Identifier
GPR
GPR
GPR
GPR
GPR
GPR
GPR
GPR
ADCDATA
P6
P5
P4
P2
52
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