upd7566a Renesas Electronics Corporation., upd7566a Datasheet - Page 30

• Manufacturer Part Number: upd7566a
• Description: 4-bit Single-chip Microcomputer
• Manufacturer: Renesas Electronics Corporation.

Timer
Control
Input/Output
CPU Control
Note Although the SPBL and RPBL instructions are to set or reset a specified bit, they also output port contents (in 4-bit units) including the specified bit
Instructions
as soon as the specified bit has been set or reset (the contents of the output latch are output to pins other than the specified bit). Before executing
these instructions, initialize the contents of the output latch by executing the OPL instruction.
TIMER
TCNTAM
IPL
IP1
OPL
RPBL
SPBL
HALT
STOP
NOP
monic
Mne-
Note
Note
rand
ope-
0 0 1 1 1 1 1 1
0 0 1 1 1 1 1 1
0 1 1 1 0 0 0 0
0 1 1 1 0 0 0 1
0 1 1 1 0 0 1 0
0 1 0 1 1 1 0 0
0 1 0 1 1 1 0 1
0 0 1 1 1 1 1 1
0 0 1 1 1 1 1 1
0 0 0 0 0 0 0 0
B1
OP Code
0 0 1 1 0 0 1 0
0 0 1 1 1 0 1 1
0 0 1 1 0 1 1 0
0 0 1 1 0 1 1 1
B2
Start Timer
A
(HL)
A
A
Port/Mode reg.(L)
Port bit (L)
Port bit (L) 1
Set Halt mode
Set Stop Mode
No operation
CT
Port (L)
Port 1
7-4
CT
3-0
0
A
Operation
Starts timer operation
Transfers higher 4 bits of count
register to accumulator, and lower 4
bits to memory addressed by HL
Loads contents of port specified by L
register to accumulator
Inputs contents of port to
accumulator
Outputs accumulator contents to port
or mode register specified by L
register
Resets bits of port 8, 10, or 11
specified by L register
Sets bits of port 8, 10, or 11
specified by L register
Sets HALT mode
Sets STOP mode
Performs nothing but waits for 1
machine cycle
Condition
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