Z86C9620VSG Zilog, Z86C9620VSG Datasheet - Page 31

• Manufacturer Part Number: Z86C9620VSG
• Description: IC Z8 20MHZ C91 W/7 PORTS 68PLCC
• Manufacturer: Zilog
• Series: Z8®r

Specifications of Z86C9620VSG

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, UART/USART
• Number Of I /o: 52
• Program Memory Type: ROMless
• Ram Size: 236 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 68-PLCC
• Processor Series: Z86C9xx
• Core: Z8
• Data Bus Width: 8 bit
• Program Memory Size: 16 KB
• Data Ram Size: 236 B
• Interface Type: UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 52
• Number Of Timers: 2
• Operating Supply Voltage: 3 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Peripherals: -
• Lead Free Status / Rohs Status: Details

Zilog
Stack. The Z86C61/62/96 has a 16-bit Stack Pointer
(R255-R254) used for external stack that resides any-
where in the data memory for the ROMless mode, but only
from 16384 to 65535 in the ROM mode. An 8-bit Stack
Pointer (R255) is used for the internal stack that resides
within the 236 general-purpose registers (R239-R4). The
high byte of the Stack Pointer (SPH-Bit 8-15) can be used
as a general purpose register when using internal stack
only.
DS97Z8X1600
1F
10
FF
F0
2F
20
0F
00
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The upper nibble of the register file address
provided by the register pointer specifies
the active working-register group.
Figure 24. Register Pointer
r7 r6 r5 r4
Register Group 1
Register Group F
Specified Working
Register Group 0
Register Group
I/O Ports
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•
•
r3 r2 r1 r0
R253
(Register Pointer)
PS003501-0301
The lower nibble
of the register
file address
provided by the
instruction points
to the specified
register.
R15 to R0
R15 to R0
R15 to R4
R3 to R0
P R E L I M I N A R Y
Counter/Timers. There are two 8-bit programmable
counter/timers (T0-T1), each driven by its own 6-bit pro-
grammable prescaler. The T1 prescaler can be driven by
internal or external clock sources; however, the T0 pres-
caler is driven by the internal clock only (Figure 22).
The 6-bit prescalers can divide the input frequency of the
clock source by any integer number from 1 to 64. Each
prescaler drives its counter, which decrements the value
(1 to 256) that has been loaded into the counter. When
both the counters and prescaler reach the end of the
count, a timer interrupt request, IRQ4 (T0) or IRQ5 (T1), is
generated.
The counter can be programmed to start, stop, restart to
continue, or restart from the initial value. The counters can
also be programmed to stop upon reaching zero (single
pass mode) or to automatically reload the initial value and
continue counting (modulo-n continuous mode).
The counter, but not the prescalers, can be read at any
time without disturbing their value or count mode. The
clock source for T1 is user-definable and can be either the
internal microprocessor clock divided-by-four, or an exter-
nal signal input through Port 3. The Timer Mode register
configures the external timer input (P31) as an external
clock, a trigger input that can be retriggerable or non-retrig-
gerable, or as a gate input for the internal clock. Port 3, line
P36, also serves as a timer output (TOUT) through which
T0, T1 or the internal clock can be output. The counter/tim-
ers can be cascaded by connecting the T0 output to the in-
put of T1.
CMOS Z8 Microcontroller
Z86C61/62/96
31
1