Z86D99 ZILOG [Zilog, Inc.], Z86D99 Datasheet - Page 61
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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PS003807-1002
Register Error Conditions
Table 13. SMR and Port Mode Registers (Group 0, Bank F, Registers 0–F)
Registers in the Z8 Standard Register File must be used correctly because certain
conditions produce inconsistent results and must be avoided.
•
•
•
•
•
Grp/Bnk Reg
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
( 0Fh )
Registers
registers,
When the Register Pointer (register FDH) is read, the least significant four bits
(lower nibble) indicate the current Expanded Register File Bank. (For
example, 0000 indicates the Standard Register File, while 1010 indicates
Expanded Register File Bank A.)
Writing to bits that are selected as timer outputs changes the I/O register but
has no effect on the pin signal.
The Z8 instruction DJNZ uses any general-purpose working register as a
counter.
Logical instructions such as OR and AND require that the current contents of
the operand be read. They do not function properly on write-only registers.
rF
rE
rD
rC
rB
rA
r9
r8
r7
r6
r5
r4
r3
r2
r1
r0
FFh
F5h
–
is returned. Reading any write-only register returns
P
F9h
Register Function
Reserved
Reserved
Reserved
Reserved
Stop Mode Recovery Register
Reserved
Reserved
ADC Control Register
Reserved
Port 6 Mode
Port 5 Stop Mode Recovery
Port 5 Mode Register
Reserved
Port 4 Mode Register
Port 2 Stop Mode Recovery
Port Configuration Register
R
are write-only registers. If an attempt is made to read these
E
L
I
M
Z86D990/Z86D991 OTP and Z86L99X ROM
I
Low-Voltage Microcontrollers with ADC
N
A
R
Y
Identifier
SMR
ADCCTRL
P6M
P5SMR
P5M
P4M
P2SMR
P456CON
FFh
.
54
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