Z86318 Datasheet, PDF (15/26 Pages) Zilog, Inc. – Z8 MCU 8-BIT MICROCONTROLLER

Z86318
Z8^® MCU 8-Bit Microcontroller
The Z86318 MCU incorporates the following special fea- Program Memory. The Z86318 device can address up to
tures to enhance the Z8^® architectural core for use in 3 KB of internal program memory (Figure 11). The first 12
mouse and trackball applications.
1 ^{bytes of Program Memory are reserved for the interrupt}
vectors. These locations contain four 16-bit vectors that
Reset. The Z86318 is reset in one of the following condi- _{correspond to the four available interrupts. Bytes 0-3064}
tions: 1) Power-On Reset (POR), 2) Watch-Dog Timer _{are programmed on-chip by means of a ROM mask option.}
(WDT) Mode, 3) Stop-Mode Recovery source, and 4) Low-
Voltage Recovery. Other sources of Reset, ports are con-
figured in an input mode, asynchronous of the clock. How-
ever, a clock is required to generate the internal reset that
resets the internal registers.
3064
Location of
First Byte of
On-Chip
ROM
Auto POR circuitry is built into the Z86318, eliminating the
need for an external reset circuit to reset on power-on.
Instruction
Executed
After RESET 12
Table 2. Z86318 Control Registers
11
IRQ5
Reset Values
Addr.Reg. D7 D6 D5 D4 D3 D2 D1 D0 Comments
F1 TMR 0 0 0 0 0 0 0 0
F2 T1 U U U U U U U U
F3 PRE1 U U U U U U 0 0
F4 T0 U U U U U U U U
F5 PRE0 U U U U U U U 0
F6* P2M 1 1 1 1 1 1 1 1 Inputs after
reset
F7* P3M U U U U U U 1 0
F8* P01M U U U 0 U U 0 1
F9 IPR U U U U U U U U
FA IRQ U U 0 0 0 0 0 0
FB IMR 0 U U U U U U U
FC FLAGS U U U U U U U U
FD RP U U U U U U U U
FF SPL U U U U U U U U
Notes: *
A reset after a Low on P27 to exit STOP mode may
affect device reliability.
10
9
8
7
Interrupt
Vector ₆
(Lower Byte)
5
4
Interrupt
Vector ₃
(Upper Byte)
2
1
0
IRQ5
IRQ4
IRQ4
Reserved
Reserved
IRQ2
IRQ2
IRQ1
IRQ1
Reserved
Reserved
Figure 11. Program Memory Map
PRELIMINARY
15