z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 183

• Manufacturer Part Number: z80189
• Description: Z80180, Z8s180, Z8l180 Mpu Operation
• Manufacturer: ZiLOG Semiconductor

168
UM005003-0703
Z8018x
Family MPU User Manual
INT, NMI
D0
–
Phi
D7
E
Figure 69.
On-Chip Clock Generator
The Z8X180 contains a crystal oscillator and system clock generator. A
crystal can be directly connected or an external clock input can be
provided. In either case, the system clock is equal to one-half the input
clock. For example, a crystal or external clock input of 8 MHz
corresponds with a system clock rate of 4 MHz.
Z8S180 and Z8L180-class processors also have the ability to run at X1
and X2 input clock.
Table 25 describes the AT cut crystal characteristics (Co, Rs) and the load
capacitance (CL1, CL2) required for various frequencies of Z8X180
operation.
T1
SLP
Instruction
2nd Op Code
Fetch Cycle
T2
76H
T3
E Clock Timing in SLEEP Mode and SYSTEM STOP Mode
T1
SLEEP mode or SYSTEM STOP mode
T2
Ts
E
Ts
E
E
Ts
Ts
T1
Op Code
Fetch Cycle
T2