Table of Contents
Advertisement
--------------------------------------------------------------HD614P080S
• D-port
Table 18 Data Input from Input/Output Common Pins
I/O circuit
type
For Standard pins
"Without pull-up MOS
(NMOS open drain)"
For High voltage pins
"Without pull-down MOS
(PMOS open drain)"
Available pin condition for input
"1"
"0"
D-port is I-bit I/O port, and it has 16 Input/Output common
pins. It can be set/reset by the SED/RED and SEDD/REDD
instructions, and can be tested by the TD and TDD instructions.
Table 17 shows the classification of standard pins, high voltage
pins and the Input/Output pins circuit types.
output is processed using the LRA and LRB instructions. The
MCV will not be affected by writing into the input-only and/or
non-existing ports, invalid data will be read by reading from the
output-only and/or non-existing ports.
The R32, R33, R40, R4I and R42 pins are also used as the
INTo, INTI, SCK, SI and SO pins respectively. Table 17 shows
the classification of standard pins, high voltage pins and Input/
Output pins circuit types .
• R-port
R-port is 4-bit I/O port. It provides 20 input/output com-
mon pins, 16 output-only pins, and 6 input-only pins. Data
input is processed using the LAR and LBR instructions and data
• RESET
The MCV is reset by setting RESET pin to "I". At power
Table 19 MCU Initial Value by Reset
Items
Initial value by
Contents
MCU reset
Program counter (PC)
$0000
Execute program from the top of ROM address.
Status (ST)
"1"
Enable to branch with conditional branch instructions.
Stack pointer (SP)
$3FF
Stack level is O.
Standard pin
Without pull-up
"1"
Enable to input.
I/O output
MOS
register
High voltage
Without pull-down
pin
MOS
"0"
Enable to input.
Interrupt Enable Flag (I/E)
"0"
Inhibit all interrupts.
Interrupt flag
Interrupt Request Flag (I F)
"0"
No interrupt request.
Interrupt Mask (1M)
"1"
Mask interrupt request.
Port Mode Register (PMR)
"0000"
See Item "Port Mode Register".
Serial Mode Register (SMR)
"0000"
See Item "Serial Mode Register".
Mode register
Timer Mode Register A (TMA)
"000"
See Item "Timer Mode Register A".
Timer Mode Register B (TMB)
"0000"
See Item "Timer Mode Register B".
Prescaler
$000
-
Timer/Counter A (TCA)
$00
-
Timer/Counter,
Timer/Event Counter B (TCB)
$00
-
Serial Interface
Timer Load Register (TLR)
$00
-
Octal Counter
"000"
-
(Note) The values of registers and flags which are not described on above table will become
as follows.
Item
After releasing stop mode
After MCU Reset
by MCU Reset
except the left
Carry
(CA)
The value immediately before
The value immediately
Accumulator
(A)
MCU reset is not guaranteed.
before MCU Reset is
B reaister
B
Initialization by the program
not guaranteed.
W register
(W)
X/SPX register
(X/SPX)
should be required.
Initialization by the
Y /SPY register
(Y/SPY)
program should be
required.
Serial data register (SR)
- ditto-
- ditto-
The value immediately before
RAM
MCU reset (the value
-ditto -
immediately before executing
stop instruction) is retained.
279
Advertisement
Table of Contents
