Z86E4312FSC Zilog, Z86E4312FSC Datasheet - Page 67

• Manufacturer Part Number: Z86E4312FSC
• Description: Z8 4K OTP 12 MHZ 44-PQFP
• Manufacturer: Zilog
• Series: Z8®r

Specifications of Z86E4312FSC

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: EBI/EMI
• Peripherals: POR, WDT
• Number Of I /o: 32
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: OTP
• Ram Size: 236 x 8
• Voltage - Supply (vcc/vdd): 3.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-LQFP
• Data Bus Width: 8 bit
• Data Ram Size: 236 B
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 2 bit
• Operating Supply Voltage: 3.5 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: No
• Other names: 269-1108

PS022901-0508
* Default setting after RESET
WDTMR (F) 0F
D7 D6 D5
Note:
WDTMR Register Accessibility. The WDTMR register is accessible only during the first
60 internal system clock cycles from the execution of the first instruction after Power-On
Reset, Watchdog reset or a Stop Mode Recovery
point, the register cannot be modified by any means, intentional or otherwise. The
WDTMR cannot be read and is located in Bank F of the Expanded Register File at address
location 0Fh.
Clock Free WDT Reset. The WDT will enable the Z8 to reset the I/0 pins whenever the
WDT times out, even without a clock source running on the XTAL1 and XTAL2 pins.
WDTMR Bit D4 must be 0 for the clock Free WDT to work. The I/O pins will default to
their default settings.
Figure 33. Watchdog Timer Mode Register Write Only
WDT time-out in STOP Mode will not reset SMR,SMR2,PCON,
WDTMR, P2M, P3M, Ports 2 & 3 Data Registers, but will activate
the T
D4 D3 D2 D1
POR
delay.
D0
WDT During HALT
0 OFF
1 ON*
WDT TAP
00
01*
10
11
WDT During STOP
0 OFF
1 ON*
XTAL1/INT RC Select for WDT
0 On-Board RC*
1 XTAL
Reserved (Must be 0)
INT RC OSC
10 ms
25 ms
80 ms
(Figure 33
5 ms
CMOS Z8
and
2048 TpC
External Clock
128 TpC
256 TpC
512 TpC
®
Product Specification
Figure
OTP Microcontrollers
Electrical Characteristics
34). After this
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