UPD6604 Datasheet, PDF (32/64 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION

9.2 Circuit Symbol Description
A
ASR
addr
CY
data4
data8
data10
F
PC
Pn
P0n
P1n
ROMn
Rn
R0n
R1n
SP
T
T0
T1
(×)
: Accumulator
: Address Stack Register
: Program memory address
: Carry flag
: 4-bit immediate data
: 8-bit immediate data
: 10-bit immediate data
: Status flag
: Program Counter
: Port register pair (n = 0, 1, 3, 4)
: Port register (low-order 4 bits)
: Port register (high-order 4 bits)
: Bit n of the program memory’s (n = 0-9)
: Register pair
: Data memory (General-purpose register; n = 0-F)
: Data memory (General-purpose register; n = 0-F)
: Stack Pointer
: Timer register
: Timer register (low-order 4 bits)
: Timer register (high-order 4 bits)
: Content addressed with ×
µPD6604
32
Data Sheet U11281EJ3V0DS00