| 摘要 |
PURPOSE:To stack the data on an internal register to a RAM with use of a bit line and giving the control to an interruption routine with a small number of cycles, by extending the bit line of a memory up to the internal register of a CPU and providing a coupling part which can control the read/write on the extended bit line. CONSTITUTION:A RAM and a CPU are mounted on a single chip and connected to each other via a bus line. thus a microcomputer is formed. The bit lines BL and BL' of the RAM are extended up to the internal registers R0-R5 of a CPU. A decoder DEC which selects the word line of the RAM, a multiplexer MPC which controls the DEC, a CPU, CTL, etc. are provided to the address and data buses set between the RAM and the CPU. Then the read/write of data is controlled between the RAM and the CPU and the data on registers R0-R5 re stacked to the RAM by means of both bit lines BL and BL'. Thus the interruption routine is controlled at a high speed. |
