Z86E3016PSG Datasheet, PDF (40/348 Pages) Zilog, Inc. – Z86E3016PSG

Z8 Family of Microcontrollers
User Manual
22
The Z8^® CPU uses a 16-bit Program Counter (PC) to determine the
sequence of current program instructions. The PC is not an addressable
register.
Peripheral registers are used to transfer data, configure the operating
mode, and control the operation of the on-chip peripherals. Any instruc-
tion that references the register file can access the peripheral registers.
The peripheral registers are:
• Serial I/O (SIO)
• Timer Mode (TMR)
• Timer/Counter 0 (T0)
• T0 Prescaler (PRE0)
• Timer/Counter 1 (T1)
• T1 Prescaler (PRE1)
• Port 0–1 Mode (P01M)
• Port 2 Mode (P2M)
• Port 3 Mode (P3M)
In addition, the four port registers (P0–P3) are considered to be peripheral
registers.
Expanded Z8 Registers
The expanded Z8 control registers govern the operation of additional fea-
tures or peripherals. Any instruction which references the register file can
access these registers.
The ERF contains the control registers for WDT, Port Control, Serial
Peripheral Interface (SPI), and the SMR functions. Figure 6 on page 15
shows the layout of the Register Banks in the ERF. Register Bank C in the
ERF consists of the registers for the SPI. Table 8 shows the registers
within ERF Bank C, Working Register Group 0.
Address Space
UM001602-0904