EM78P372N数据手册
EM78P372N8-Bit Microcontroller6Functional Description 6.1 Operational Registers6.1.1 R0 (Indirect Address Register)R0 is not a physically implemented register. It is used as an indirect address pointer. Any instruction using R0 as a pointer, actually accesses the data pointed by the RAM Select Register (R4).6.1.2 R1 (Time Clock/Counter) Incremented by an external signal edge which is defined by the TE bit (CONT-5) through the TCC pin, or by the instruction cycle clock. Writable and readable as any other registers. The TCC prescaler counter is assigned to TCC The contents of the CONT register is cleared whenever – a value is written to the TCC register a value is written to the TCC prescaler bits (Bits 3, 2, 1, 0 of the CONT register) there’s power-on reset, /RESET, or WDT time out reset 6.1.3 R2 (Program Counter) and StackFigure 6-1 Program Counter Organization6 Product Specification (V1.1) 05.24.2011(This specification is subject to change without further notice)