MSM63238

E2E0027-38-95 ¡ Semiconductor MSM63238 ¡ Semiconductor This version: MSM63238 Sep. 1998 Previous version: Mar. 1996 4-Bit Microcontroller with Built-in POCSAG Decoder and Melody Circuit, Operating at 0.9 V (Min.) GENERAL DESCRIPTION The MSM63238 is a CMOS 4-bit microcontroller with a built-in POCSAG (Post Office Code Standardization Advisory Group) decoder. The MSM63238 employs Oki's original nX-4/250 CPU core and is suitable for pager applications. The MSM63P238 is a one-time-programmable ROM-version product having one-time PROM (OTP) as internal program memory. The specifications of the MSM63P238 are equal to those of the MSM63238 except for electrical characteristics, packaging (only 80-pin flat package is available for the MSM63P238), and some functions. FEATURES Rich instruction set 439 instructions Transfer, rotate, increment/decrement, arithmetic operations, comparison, logic operations, mask operations, bit operations, ROM table reference, external memory transfer, stack operations, flag operations, branch, conditional branch, call/return, control. Rich selection of addressing modes Indirect addressing of four data memory types, with current bank register, extra bank register, HL register and XY register. Data memory bank internal direct addressing mode. Processing speed Two clocks per machine cycle, with most instructions executed in one machine cycle. Minimum instruction execution time : 61 ms (@ 32.768 kHz system clock) 1 ms (@ 2 MHz system clock) Cloc...