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UPD64AMC Datasheet(PDF) 43 Page - NEC

Part # UPD64AMC
Description  4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
PDF  64 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD64AMC Datasheet(HTML) 43 Page - NEC

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43
µPD64A, 65
Data Sheet U14380EJ2V0DS00
9.8 Subroutine Instructions
The program memory consists of pages in steps of 1K (000H to 3FFH). However, as the assembler automatically
performs page optimization, it is unnecessary to designate pages. The pages allowed for each product are as
follows.
µPD64A (ROM: 1K steps)
: page 0
µPD65 (ROM: 2K steps)
: pages 0, 1
µPD6P5 (PROM: 2K steps) : pages 0, 1
CALL addr
<1> Instruction code
: 0 01101001 0
page 0
0100010001
; page 1 0100110001
a9 a7 a6 a5 a4 a8 a3 a2 a1 a0
<2> Cycle count
: 2
<3> Function
: SP
← SP + 1
ASR
← PC
PC
← addr
Increments (+1) the stack pointer value and saves the program counter value in the address stack
register. Then, enters the address specified with the operand addr (a9 to a0) into the program counter.
If a carry is generated when the stack pointer value is incremented (+1), an internal reset takes effect.
RET
<1> Instruction code
: 0 10001001 0
<2> Cycle count
: 1
<3> Function
: PC
← ASR
SP
← SP – 1
Restores the value saved in the address stack register to the program counter. Then, decrements
(–1) the stack pointer.
If a borrow is generated when the stack pointer value is decremented (–1), an internal reset takes effect.



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